$AON
Aon PLC Stock $aon

$aon Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-K Financial Statement

#000162828019001558 Filed on February 19, 2019

Income Statement

Concept	2018 Q4	2018 Q1	2018
Revenue	$2.770B	$3.090B	$10.77B
YoY Change	-4.78%	29.78%	7.72%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$2.003B	$2.069B	$7.985B
YoY Change	-7.65%	6.16%	-0.71%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$151.0M	$39.00M	$176.0M
YoY Change	8.63%	-27.78%	-5.88%
% of Gross Profit
Operating Expenses	$2.152B	$2.217B	$8.565B
YoY Change	-6.76%	8.36%	0.14%
Operating Profit	$499.0M	$799.0M	$1.544B
YoY Change	-16.97%	138.51%	44.98%
Interest Expense	-$82.00M	$70.00M	$278.0M
YoY Change	13.89%	0.0%	-1.42%
% of Operating Profit	-16.43%	8.76%	18.01%
Other Income/Expense, Net	$6.000M	-$15.00M	-$25.00M
YoY Change	-105.5%	650.0%	-80.0%
Pretax Income	$421.0M	$718.0M	$1.246B
YoY Change	3.69%	170.94%	81.9%
Income Tax	$49.00M	$114.0M	$146.0M
% Of Pretax Income	11.64%	15.88%	11.72%
Net Earnings	$353.0M	$610.0M	$1.174B
YoY Change	-3041.67%	100.0%	-7.05%
Net Earnings / Revenue	12.74%	19.74%	10.9%
Basic Earnings Per Share	$1.42	$2.39	$4.62
Diluted Earnings Per Share	$1.41	$2.37	$4.59
COMMON SHARES
Basic Shares Outstanding	240.8M shares	248.5M shares	245.2M shares
Diluted Shares Outstanding		250.2M shares	247.0M shares

Balance Sheet

Concept	2018 Q4	2018 Q1	2018
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.728B	$4.815B	$4.728B
YoY Change	267.94%	660.66%	267.94%
Cash & Equivalents	$656.0M	$597.0M	$656.0M
Short-Term Investments	$4.072B	$4.218B	$4.072B
Other Short-Term Assets	$618.0M	$587.0M	$176.0M
YoY Change	113.84%	89.97%	-98.2%
Inventory
Prepaid Expenses	$97.00M	$142.0M
Receivables	$2.760B	$2.730B	$9.355B
Other Receivables	$113.0M	$118.0M	$113.0M
Total Short-Term Assets	$14.37B	$15.12B	$14.37B
YoY Change	5.08%	-1.81%	5.08%
LONG-TERM ASSETS
Property, Plant & Equipment	$588.0M	$578.0M	$588.0M
YoY Change	4.26%	7.84%	4.26%
Goodwill	$8.171B	$8.550B
YoY Change	-2.24%	13.34%
Intangibles	$1.149B	$1.662B
YoY Change	-33.7%	-42.39%
Long-Term Investments	$54.00M	$58.00M	$54.00M
YoY Change	-5.26%	-52.07%	-5.26%
Other Assets	$448.0M	$452.0M	$1.832B
YoY Change	45.93%	19.26%	13.44%
Total Long-Term Assets	$588.0M	$12.73B	$12.05B
YoY Change	4.26%	9.86%	-2.91%
TOTAL ASSETS
Total Short-Term Assets	$14.37B	$15.12B	$14.37B
Total Long-Term Assets	$588.0M	$12.73B	$12.05B
Total Assets	$26.42B	$27.85B	$26.42B
YoY Change	1.28%	3.21%	1.28%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.943B	$1.545B	$1.943B
YoY Change	-0.92%	15.99%	-0.92%
Accrued Expenses
YoY Change
Deferred Revenue	$251.0M
YoY Change	-19.29%
Short-Term Debt	$0.00	$0.00	$250.0M
YoY Change
Long-Term Debt Due	$251.0M	$403.0M	$1.000M
YoY Change	-16.05%	-39.58%	-99.67%
Total Short-Term Liabilities	$13.30B	$13.66B	$13.30B
YoY Change	4.24%	5.3%	4.24%
LONG-TERM LIABILITIES
Long-Term Debt	$5.993B	$5.697B	$6.162B
YoY Change	5.75%	1.55%	5.88%
Other Long-Term Liabilities	$1.097B	$1.099B	$2.564B
YoY Change	-0.45%	49.93%	-6.36%
Total Long-Term Liabilities	$7.090B	$6.796B	$8.726B
YoY Change	4.74%	7.14%	1.96%
TOTAL LIABILITIES
Total Short-Term Liabilities	$13.30B	$13.66B	$13.30B
Total Long-Term Liabilities	$7.090B	$6.796B	$8.726B
Total Liabilities	$22.20B	$22.46B	$22.27B
YoY Change	3.56%	6.17%	3.56%
SHAREHOLDERS EQUITY
Retained Earnings	$2.093B	$2.747B
YoY Change	-9.08%	-30.17%
Common Stock	$5.967B	$5.745B
YoY Change	3.29%	3.14%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.151B	$5.301B	$4.151B
YoY Change
Total Liabilities & Shareholders Equity	$26.42B	$27.85B	$26.42B
YoY Change	1.28%	3.21%	1.28%

Cashflow Statement

Concept	2018 Q4	2018 Q1	2018
OPERATING ACTIVITIES
Net Income	$353.0M	$610.0M	$1.174B
YoY Change	-3041.67%	100.0%	-7.05%
Depreciation, Depletion And Amortization	$151.0M	$39.00M	$176.0M
YoY Change	8.63%	-27.78%	-5.88%
Cash From Operating Activities	$711.0M	$140.0M	$1.686B
YoY Change	86.61%	-41.67%	129.7%
INVESTING ACTIVITIES
Capital Expenditures	-$61.00M	$45.00M	$240.0M
YoY Change	5.17%	32.35%	31.15%
Acquisitions		$29.00M	$58.00M
YoY Change		-36.96%	-94.36%
Other Investing Activities	$8.000M	$391.0M	$271.0M
YoY Change	-97.52%	731.91%	-90.88%
Cash From Investing Activities	-$53.00M	$346.0M	$31.00M
YoY Change	-120.0%	2561.54%	-98.89%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$569.0M
YoY Change		351.59%
Debt Paid & Issued, Net		$704.0M	$5.417B
YoY Change		-25.89%	170.99%
Cash From Financing Activities	-444.0M	-$663.0M	-$1.699B
YoY Change	-28.04%	156.98%	-47.96%
NET CHANGE
Cash From Operating Activities	711.0M	$140.0M	$1.686B
Cash From Investing Activities	-53.00M	$346.0M	$31.00M
Cash From Financing Activities	-444.0M	-$663.0M	-$1.699B
Net Change In Cash	214.0M	-$159.0M	-$100.0M
YoY Change	637.93%	3080.0%	-130.77%
FREE CASH FLOW
Cash From Operating Activities	$711.0M	$140.0M	$1.686B
Capital Expenditures	-$61.00M	$45.00M	$240.0M
Free Cash Flow	$772.0M	$95.00M	$1.446B
YoY Change	75.85%	-53.88%	162.43%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017Q4	aon	Deferred Tax Assets Lease Guarantees DeferredTaxAssetsLeaseGuarantees	6000000	USD
CY2018Q4	aon	Deferred Tax Assets Lease Guarantees DeferredTaxAssetsLeaseGuarantees	5000000	USD
CY2017Q4	aon	Deferred Tax Assets Net Operating And Capital Loss Carryforwards And Tax Credit Carryforwards DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards	362000000	USD
CY2018Q4	aon	Deferred Tax Assets Net Operating And Capital Loss Carryforwards And Tax Credit Carryforwards DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards	563000000	USD
CY2017Q4	aon	Deferred Tax Liabilities Intangible Assets And Property Plant And Equipment DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment	436000000	USD
CY2017Q4	aon	Cashand Cash Equivalentsand Short Term Investments CashandCashEquivalentsandShortTermInvestments	1285000000	USD
CY2018Q4	aon	Cashand Cash Equivalentsand Short Term Investments CashandCashEquivalentsandShortTermInvestments	828000000	USD
CY2018	aon	Debt Number Of Committed Credit Facilities DebtNumberOfCommittedCreditFacilities	2	credit_facility
CY2017Q4	aon	Deferred Tax Assets Brokerage Fee Arrangements DeferredTaxAssetsBrokerageFeeArrangements	4000000	USD
CY2018Q4	aon	Deferred Tax Assets Brokerage Fee Arrangements DeferredTaxAssetsBrokerageFeeArrangements	0	USD
CY2018Q4	aon	Deferred Tax Liabilities Intangible Assets And Property Plant And Equipment DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment	310000000	USD
CY2017Q4	aon	Deferred Tax Liabilities Other Accrued Expenses DeferredTaxLiabilitiesOtherAccruedExpenses	12000000	USD
CY2018Q4	aon	Deferred Tax Liabilities Other Accrued Expenses DeferredTaxLiabilitiesOtherAccruedExpenses	36000000	USD
CY2018Q4	aon	Defined Benefit Plan Percentage Of Total Pension Obligations DefinedBenefitPlanPercentageOfTotalPensionObligations	0.90
CY2017Q4	aon	Distributable Reserves Available Amount DistributableReservesAvailableAmount	1200000000	USD
CY2018Q4	aon	Distributable Reserves Available Amount DistributableReservesAvailableAmount	2200000000	USD
CY2016	aon	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent	0.000
CY2017	aon	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent	0.512
CY2018	aon	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent	0.071
CY2017Q4	aon	Employeerelated Liabilities Noncurrent EmployeerelatedLiabilitiesNoncurrent	67000000	USD
CY2018Q4	aon	Employeerelated Liabilities Noncurrent EmployeerelatedLiabilitiesNoncurrent	56000000	USD
CY2016	aon	Equity Earnings From Subsidiaries EquityEarningsFromSubsidiaries	0	USD
CY2017	aon	Equity Earnings From Subsidiaries EquityEarningsFromSubsidiaries	0	USD
CY2018	aon	Equity Earnings From Subsidiaries EquityEarningsFromSubsidiaries	0	USD
CY2016	aon	Equity Other Comprehensive Income Loss From Subsidiaries EquityOtherComprehensiveIncomeLossFromSubsidiaries	0	USD
CY2017	aon	Equity Other Comprehensive Income Loss From Subsidiaries EquityOtherComprehensiveIncomeLossFromSubsidiaries	0	USD
CY2018	aon	Equity Other Comprehensive Income Loss From Subsidiaries EquityOtherComprehensiveIncomeLossFromSubsidiaries	0	USD
CY2017Q4	aon	Fiduciary Assets FiduciaryAssets	9625000000	USD
CY2018Q4	aon	Fiduciary Assets FiduciaryAssets	10166000000	USD
CY2017Q4	aon	Fiduciary Assets Premium Trust Balances FiduciaryAssetsPremiumTrustBalances	3700000000	USD
CY2018Q4	aon	Fiduciary Assets Premium Trust Balances FiduciaryAssetsPremiumTrustBalances	3900000000	USD
CY2017Q4	aon	Fiduciary Liabilities FiduciaryLiabilities	1961000000	USD
CY2018Q4	aon	Fiduciary Liabilities FiduciaryLiabilities	1943000000	USD
CY2016	aon	Gainon Saleof Businessand Investments Net GainonSaleofBusinessandInvestmentsNet	39000000	USD
CY2017	aon	Gainon Saleof Businessand Investments Net GainonSaleofBusinessandInvestmentsNet	-16000000	USD
CY2018	aon	Gainon Saleof Businessand Investments Net GainonSaleofBusinessandInvestmentsNet	-6000000	USD
CY2018	aon	Hedge Gain Loss To Be Reclassified During Next12 Months HedgeGainLossToBeReclassifiedDuringNext12Months	-13000000	USD
CY2016	aon	Income Loss Before Equity Earnings Of Subsidiaries IncomeLossBeforeEquityEarningsOfSubsidiaries	1430000000	USD
CY2017	aon	Income Loss Before Equity Earnings Of Subsidiaries IncomeLossBeforeEquityEarningsOfSubsidiaries	1263000000	USD
CY2018	aon	Income Loss Before Equity Earnings Of Subsidiaries IncomeLossBeforeEquityEarningsOfSubsidiaries	1174000000	USD
CY2016	aon	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	1401000000	USD
CY2017	aon	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	685000000	USD
CY2018	aon	Income Loss From Continuing Operations Before Income Taxes IncomeLossFromContinuingOperationsBeforeIncomeTaxes	1246000000	USD
CY2016	aon	Income Tax Holiday Income Tax Benefits IncomeTaxHolidayIncomeTaxBenefits	46000000	USD
CY2017	aon	Income Tax Holiday Income Tax Benefits IncomeTaxHolidayIncomeTaxBenefits	45000000	USD
CY2018	aon	Income Tax Holiday Income Tax Benefits IncomeTaxHolidayIncomeTaxBenefits	77000000	USD
CY2016	aon	Increase Decrease In Fiduciary Liabilities IncreaseDecreaseInFiduciaryLiabilities	-55000000	USD
CY2017	aon	Increase Decrease In Fiduciary Liabilities IncreaseDecreaseInFiduciaryLiabilities	-36000000	USD
CY2018	aon	Increase Decrease In Fiduciary Liabilities IncreaseDecreaseInFiduciaryLiabilities	999000000	USD
CY2016	aon	Increase Decrease In Fiduciary Receivables IncreaseDecreaseInFiduciaryReceivables	-595000000	USD
CY2017	aon	Increase Decrease In Fiduciary Receivables IncreaseDecreaseInFiduciaryReceivables	-171000000	USD
CY2018	aon	Increase Decrease In Fiduciary Receivables IncreaseDecreaseInFiduciaryReceivables	679000000	USD
CY2016	aon	Intercompany Interest Expense Income IntercompanyInterestExpenseIncome	0	USD
CY2017	aon	Intercompany Interest Expense Income IntercompanyInterestExpenseIncome	0	USD
CY2018	aon	Intercompany Interest Expense Income IntercompanyInterestExpenseIncome	0	USD
CY2016	aon	Intercompany Other Income Expense Net IntercompanyOtherIncomeExpenseNet	0	USD
CY2017	aon	Intercompany Other Income Expense Net IntercompanyOtherIncomeExpenseNet	0	USD
CY2018	aon	Intercompany Other Income Expense Net IntercompanyOtherIncomeExpenseNet	0	USD
CY2017Q4	aon	Interest Carryforward InterestCarryforward	196000000	USD
CY2017Q4	aon	Investments In Subsidiaries InvestmentsInSubsidiaries	0	USD
CY2018Q4	aon	Investments In Subsidiaries InvestmentsInSubsidiaries	0	USD
CY2018	aon	Noncashpaymentoflongtermdebt Noncashpaymentoflongtermdebt	-102000000	USD
CY2018	aon	Number Of Performance Metrics Measured NumberOfPerformanceMetricsMeasured	4	metric
CY2018	aon	Numberof Revenue Lines NumberofRevenueLines	5	revenue_line
CY2018Q4	aon	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals After Year Five OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsAfterYearFive	5000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals Year Five OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearFive	12000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals Year Four OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearFour	30000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals Year Three OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsYearThree	30000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Due Future Sublease Rentalsnexttwelvemonths OperatingLeasesFutureMinimumPaymentsDueFutureSubleaseRentalsnexttwelvemonths	34000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Due Net Of Sublease Rental Income Current OperatingLeasesFutureMinimumPaymentsDueNetOfSubleaseRentalIncomeCurrent	269000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Due Year Two OperatingLeasesFutureMinimumPaymentsDueYearTwo	30000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Net Of Sublease Rental Income Due OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDue	1438000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Net Of Sublease Rental Income Due In Five Years OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDueInFiveYears	136000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Net Of Sublease Rental Income Due In Four Years OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDueInFourYears	152000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Net Of Sublease Rental Income Due In Three Years OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDueInThreeYears	191000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Net Of Sublease Rental Income Due Thereafter OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDueThereafter	467000000	USD
CY2018Q4	aon	Operating Leases Future Minimum Payments Net Of Sublease Rentals Due In Two Years OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInTwoYears	223000000	USD
CY2016	aon	Other General Expenses OtherGeneralExpenses	1036000000	USD
CY2017	aon	Other General Expenses OtherGeneralExpenses	1272000000	USD
CY2018	aon	Other General Expenses OtherGeneralExpenses	1500000000	USD
CY2017Q4	aon	Other Tax Assets Current OtherTaxAssetsCurrent	114000000	USD
CY2018Q4	aon	Other Tax Assets Current OtherTaxAssetsCurrent	113000000	USD
CY2016	aon	Payments For Proceeds From Marketable Securities PaymentsForProceedsFromMarketableSecurities	-61000000	USD
CY2017	aon	Payments For Proceeds From Marketable Securities PaymentsForProceedsFromMarketableSecurities	232000000	USD
CY2018	aon	Payments For Proceeds From Marketable Securities PaymentsForProceedsFromMarketableSecurities	-348000000	USD
CY2017Q4	aon	Restricted Cash Operating Funds RestrictedCashOperatingFunds	57100000	USD
CY2017Q4	aon	Restricted Cash Operating Funds RestrictedCashOperatingFunds	42700000	GBP
CY2018Q4	aon	Restricted Cash Operating Funds RestrictedCashOperatingFunds	53900000	USD
CY2018Q4	aon	Restricted Cash Operating Funds RestrictedCashOperatingFunds	42700000	GBP
	aon	Tax Cuts And Jobs Act Allocation Of Tax Benefit From Foreign Tax Credits TaxCutsAndJobsActAllocationOfTaxBenefitFromForeignTaxCredits	59000000	USD
	aon	Tax Cuts And Jobs Act Change In Tax Rate Income Tax Expense Benefit TaxCutsAndJobsActChangeInTaxRateIncomeTaxExpenseBenefit	78000000	USD
	aon	Tax Cuts And Jobs Act Income Tax Expense Benefit TaxCutsAndJobsActIncomeTaxExpenseBenefit	433000000	USD
	aon	Tax Cuts And Jobs Act Indefinite Reinvestment Assertion Income Tax Expense Benefit TaxCutsAndJobsActIndefiniteReinvestmentAssertionIncomeTaxExpenseBenefit	-4000000	USD
CY2017	aon	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateProvisionalIncomeTaxExpenseBenefit	86000000	USD
CY2017	aon	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Indefinite Reinvestment Assertion Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingIndefiniteReinvestmentAssertionProvisionalIncomeTaxExpenseBenefit	-5000000	USD
CY2017Q4	aon	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	345000000	USD
CY2017	aon	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Income Tax Expense TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalIncomeTaxExpense	264000000	USD
CY2017Q4	aon	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Liability Current TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiabilityCurrent	42000000	USD
CY2017Q4	aon	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Liability Noncurrent TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiabilityNoncurrent	222000000	USD
CY2018Q4	aon	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Liability Noncurrent TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiabilityNoncurrent	240000000	USD
CY2018	aon	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Allocation Of Tax Benefit From Foreign Tax Credits TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentAllocationOfTaxBenefitFromForeignTaxCredits	59000000	USD
CY2018	aon	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Change In Tax Rate Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentChangeInTaxRateProvisionalIncomeTaxExpenseBenefit	-8000000	USD
CY2018	aon	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Indefinite Reinvestment Assertion Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIndefiniteReinvestmentAssertionProvisionalIncomeTaxExpenseBenefit	1000000	USD
CY2018	aon	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentProvisionalIncomeTaxExpenseBenefit	88000000	USD
CY2018	aon	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Provisional Income Tax Expense TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsProvisionalIncomeTaxExpense	36000000	USD
	aon	Tax Cuts And Jobs Act Transition Tax For Accumulated Foreign Earnings Income Tax Expense TaxCutsAndJobsActTransitionTaxForAccumulatedForeignEarningsIncomeTaxExpense	300000000	USD
CY2017Q4	aon	Tax Cuts And Jobs Act Transition Tax For Accumulated Foreign Earnings Liability TaxCutsAndJobsActTransitionTaxForAccumulatedForeignEarningsLiability	264000000	USD
CY2018Q4	aon	Tax Cuts And Jobs Act Transition Tax For Accumulated Foreign Earnings Liability TaxCutsAndJobsActTransitionTaxForAccumulatedForeignEarningsLiability	240000000	USD
CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2018Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	10166000000	USD
CY2018Q1	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	1969000000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	2478000000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	2760000000	USD
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0000315293
CY2019Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	239999442	shares
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018Q2	dei	Entity Public Float EntityPublicFloat	33332666779	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	Aon plc
CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2017Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	9625000000	USD
CY2018Q1	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	2730000000	USD
CY2017Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	139000000	USD
CY2018Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	83000000	USD
CY2017Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	529000000	USD
CY2018Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	585000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1169000000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1145000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3496000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3909000000	USD
CY2018	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P7Y
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	5775000000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	5965000000	USD
CY2016	us-gaap	Adjustment For Amortization AdjustmentForAmortization	157000000	USD
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CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	319000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	338000000	USD
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CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	59000000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	62000000	USD
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CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	593000000	USD
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CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2017Q4	us-gaap	Assets Assets	26088000000	USD
CY2018Q4	us-gaap	Assets Assets	26422000000	USD
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CY2018Q4	us-gaap	Assets Current AssetsCurrent	14372000000	USD
CY2017Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	564000000	USD
CY2018Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	588000000	USD
CY2017Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	153000000	USD
CY2018Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	169000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	756000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	656000000	USD
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CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value Including Discontinued Operations CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations	656000000	USD
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CY2018	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	0	USD
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CY2018	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	0	USD
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CY2017	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	65000000	USD
CY2018	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	0	USD
CY2016	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.29
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.41
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.56
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.29
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.41
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.56
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	750000000	shares
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	750000000	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	247600000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	240100000	shares
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	2000000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	2000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	907000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1642000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	722000000	USD
CY2017Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	0	USD
CY2018Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	329000000	USD
CY2017Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	0	USD
CY2018Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	156000000	USD
CY2017Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	311000000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	251000000	USD
CY2017Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	49000000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	65000000	USD
CY2018	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	487000000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	7598000000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	8933000000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	9226000000	USD
CY2017Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	49000000	USD
CY2018Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	492000000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	248000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	268000000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	371000000	USD
CY2017Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	5966000000	USD
CY2018Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	6244000000	USD
CY2017Q4	us-gaap	Debt Current DebtCurrent	299000000	USD
CY2018Q4	us-gaap	Debt Current DebtCurrent	251000000	USD
CY2018Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	6346000000	USD
CY2017Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	389000000	USD
CY2018Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	561000000	USD
CY2018Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	261000000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-100000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-18000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-225000000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	127000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	49000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	46000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	424000000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	181000000	USD
CY2018Q1	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	169000000	USD
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CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-18000000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-225000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	20000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	29000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	12000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	977000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1120000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	35000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	28000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	262000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	380000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	841000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	949000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	389000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	561000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	351000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	65000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	98000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	136000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	171000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	579000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	569000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	127000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	181000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	38000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	24000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	32000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	143000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	39000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	30000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Unrealized Currency Transaction Gains DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains	22000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Unrealized Currency Transaction Gains DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains	26000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	1060000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	1133000000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	191000000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	173000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	168000000	USD
CY2016	us-gaap	Depreciation Depreciation	162000000	USD
CY2017	us-gaap	Depreciation Depreciation	187000000	USD
CY2018	us-gaap	Depreciation Depreciation	176000000	USD
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CY2016	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-14000000	USD
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CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-49000000	USD
CY2016	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-10000000	USD
CY2017	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-1000000	USD
CY2018	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-11000000	USD
CY2016	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
CY2017	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
CY2018	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Net DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet	28000000	USD
CY2018Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Net DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet	12000000	USD
CY2015Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	2000000	USD
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CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	0	USD
CY2016	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	39000000	USD
CY2017	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-16000000	USD
CY2018	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-6000000	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	345000000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	364000000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	382000000	USD
CY2017Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	0	USD
CY2018Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	0	USD
CY2017Q4	us-gaap	Due From Related Parties Noncurrent DueFromRelatedPartiesNoncurrent	0	USD
CY2018Q4	us-gaap	Due From Related Parties Noncurrent DueFromRelatedPartiesNoncurrent	0	USD
CY2017Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	0	USD
CY2018Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	0	USD
CY2017Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	0	USD
CY2018Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	0	USD
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.21
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.10
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.93
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.72
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CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.74
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CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
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CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.62
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CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.09
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CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.07
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.70
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.37
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.41
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.59
CY2016	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-39000000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	69000000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-118000000	USD
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.106
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.365
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.117
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.200
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CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.190
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CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.018
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.038
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	0.000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	0.000
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	-0.102
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.122
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.303
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.073
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.014
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.034
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.027
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.080
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.036
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.012
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.006
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.012
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.012
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.020
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.009
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.004
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.015
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.004
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.032
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.016
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.009
CY2018	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y1M0D
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	90000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	73000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	74000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2280000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2509000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	263000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	385000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	72000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	84000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	126000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	219000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	4013000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	3658000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1149000000	USD
CY2016	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-2000000	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-37000000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	25000000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	7410000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	8358000000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	8171000000	USD
CY2017	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	619000000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	38000000	USD
CY2017	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	347000000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-227000000	USD
CY2017	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-13000000	USD
CY2018	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	4000000	USD
CY2017	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	5000000	USD
CY2018	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	2000000	USD
CY2017Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	95000000	USD
CY2018Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	103000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1401000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	685000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1246000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1253000000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	265000000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-43000000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	196000000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	17000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	435000000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	604000000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	57000000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	155000000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	284000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1100000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.55
CY2017Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.95
CY2017Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.20
CY2017Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.74
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.29
CY2017Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.04
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.54
CY2018Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.37
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.19
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.61
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.14
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.32
CY2016	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.51
CY2017Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.94
CY2017Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.20
CY2017Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.73
CY2017Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.04
CY2017	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.53
CY2018Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.35
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.19
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.61
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.13
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	177000000	USD
CY2017Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	40000000	USD
CY2017Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	821000000	USD
CY2017Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-4000000	USD
CY2017Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-29000000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	828000000	USD
CY2018Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	6000000	USD
CY2018Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	1000000	USD
CY2018Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-2000000	USD
CY2018Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	69000000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	74000000	USD
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.66
CY2017Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.15
CY2017Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	3.13
CY2017Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.02
CY2017Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.12
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	3.20
CY2018Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.02
CY2018Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2018Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.01
CY2018Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.28
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.30
CY2016	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.65
CY2017Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.15
CY2017Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	3.13
CY2017Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.01
CY2017Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.11
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	3.17
CY2018Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.02
CY2018Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2018Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.01
CY2018Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.28
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.30
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	13000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	12000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	4000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	148000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	250000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	146000000	USD
CY2016	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.17
CY2017	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.17
CY2018	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.31
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	218000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1182000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	337000000	USD
CY2017Q4	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	84000000	USD
CY2018Q4	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	100000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	53000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	96000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	25000000	USD
CY2016	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-42000000	USD
CY2017	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-914000000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	34000000	USD
CY2016	us-gaap	Increase Decrease In Client Funds Held IncreaseDecreaseInClientFundsHeld	540000000	USD
CY2017	us-gaap	Increase Decrease In Client Funds Held IncreaseDecreaseInClientFundsHeld	135000000	USD
CY2018	us-gaap	Increase Decrease In Client Funds Held IncreaseDecreaseInClientFundsHeld	320000000	USD
CY2016	us-gaap	Increase Decrease In Due To Affiliates IncreaseDecreaseInDueToAffiliates	0	USD
CY2017	us-gaap	Increase Decrease In Due To Affiliates IncreaseDecreaseInDueToAffiliates	0	USD
CY2018	us-gaap	Increase Decrease In Due To Affiliates IncreaseDecreaseInDueToAffiliates	0	USD
CY2016	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-66000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	8000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-2000000	USD
CY2016	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	42000000	USD
CY2017	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-66000000	USD
CY2018	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-259000000	USD
CY2016	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	105000000	USD
CY2017	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	254000000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	127000000	USD
CY2016	us-gaap	Increase Decrease In Restructuring Reserve IncreaseDecreaseInRestructuringReserve	0	USD
CY2017	us-gaap	Increase Decrease In Restructuring Reserve IncreaseDecreaseInRestructuringReserve	172000000	USD
CY2018	us-gaap	Increase Decrease In Restructuring Reserve IncreaseDecreaseInRestructuringReserve	23000000	USD
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2200000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2200000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1800000	shares
CY2016	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	386000000	USD
CY2017	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	419000000	USD
CY2018	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	484000000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1733000000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1149000000	USD
CY2016	us-gaap	Interest Expense InterestExpense	282000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	282000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	278000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	272000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	272000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	266000000	USD
CY2016	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	9000000	USD
CY2017	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	27000000	USD
CY2018	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	5000000	USD
CY2016	us-gaap	Labor And Related Expense LaborAndRelatedExpense	5514000000	USD
CY2017	us-gaap	Labor And Related Expense LaborAndRelatedExpense	6003000000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	6103000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	358000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	377000000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	374000000	USD
CY2017Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	96000000	USD
CY2018Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	83000000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	21440000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	22203000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	26088000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	26422000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	12755000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	13296000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	6244000000	USD
CY2017Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	6267000000	USD
CY2018Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	6159000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	5095000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	251000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	400000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	600000000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5667000000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5993000000	USD
CY2017Q4	us-gaap	Long Term Investments LongTermInvestments	57000000	USD
CY2018Q4	us-gaap	Long Term Investments LongTermInvestments	54000000	USD
CY2017Q4	us-gaap	Minority Interest MinorityInterest	65000000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	68000000	USD
CY2016	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	28000000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	27000000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	32000000	USD
CY2016	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	38000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	31000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-888000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	2806000000	USD
CY2017	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	11000000	USD
CY2018	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	1000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1286000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3265000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1699000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-1286000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-3265000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-1699000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-954000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	2787000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	31000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2326000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	734000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1686000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1829000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	669000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1686000000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	34000000	USD
CY2017Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	14000000	USD
CY2017Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	9000000	USD
CY2017Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7000000	USD
CY2017Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7000000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	37000000	USD
CY2018Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	16000000	USD
CY2018Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	10000000	USD
CY2018Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000000	USD
CY2017Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	291000000	USD
CY2017Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	769000000	USD
CY2018Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	8000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	40000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1396000000	USD
CY2017Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	185000000	USD
CY2018	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	8	acquisition
CY2018	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2016	us-gaap	Occupancy Net OccupancyNet	343000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-16000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	262000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	499000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1544000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1579000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	303000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	141000000	USD
CY2017Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-19000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1226000000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	594000000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48000000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	147000000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	345000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1134000000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-137000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-125000000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-25000000	USD
CY2017	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	17	acquisition
CY2017	us-gaap	Occupancy Net OccupancyNet	348000000	USD
CY2018	us-gaap	Occupancy Net OccupancyNet	370000000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	1811000000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	335000000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-127000000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	256000000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	601000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	1065000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	799000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	148000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	182000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	221000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	253000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	472000000	USD
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	306000000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	320000000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	329000000	USD
CY2016	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	52000000	USD
CY2017	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	57000000	USD
CY2018	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	45000000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	420000000	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	602000000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	304000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-791000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	195000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-576000000	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	222000000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	289000000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	618000000	USD
CY2018Q1	us-gaap	Other Assets Current OtherAssetsCurrent	587000000	USD
CY2017Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	21000000	USD
CY2018Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	67000000	USD
CY2017Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	166000000	USD
CY2018Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	138000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	307000000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	448000000	USD
CY2018Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	452000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-714000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	242000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-533000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-495000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	390000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-444000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-491000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	421000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-416000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-2000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	5000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-4000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-489000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	416000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-412000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-16000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-19000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-17000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-77000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-47000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-43000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-25000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	18000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-18000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-12000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	12000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	11000000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	870000000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	936000000	USD
CY2018Q1	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	883000000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1102000000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1097000000	USD
CY2018Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1099000000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-137000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-125000000	USD
CY2016	us-gaap	Payments For Repurchase Of Equity PaymentsForRepurchaseOfEquity	1257000000	USD
CY2017	us-gaap	Payments For Repurchase Of Equity PaymentsForRepurchaseOfEquity	2399000000	USD
CY2018	us-gaap	Payments For Repurchase Of Equity PaymentsForRepurchaseOfEquity	1470000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	58000000	USD
CY2016	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	64000000	USD
CY2017	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	64000000	USD
CY2018	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	80000000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	156000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	183000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	240000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-36000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-35000000	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	43000000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	68000000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	345000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	364000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	382000000	USD
CY2016	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	129000000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	121000000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	149000000	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	879000000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1029000000	USD
CY2016	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	77000000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	36000000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	35000000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	1789000000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	1636000000	USD
CY2016	us-gaap	Pension Expense PensionExpense	173000000	USD
CY2017	us-gaap	Pension Expense PensionExpense	86000000	USD
CY2018	us-gaap	Pension Expense PensionExpense	-1000000	USD
CY2017Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	126000000	USD
CY2018Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	97000000	USD
CY2016	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	107000000	USD
CY2017	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	4246000000	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	-10000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	3467000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1654000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	5754000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-77000000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	71000000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	1430000000	USD
CY2017Q1	us-gaap	Profit Loss ProfitLoss	305000000	USD
CY2017Q2	us-gaap	Profit Loss ProfitLoss	778000000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	192000000	USD
CY2017Q4	us-gaap	Profit Loss ProfitLoss	-12000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1263000000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	610000000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	58000000	USD
CY2018	us-gaap	Revenues Revenues	10770000000	USD
CY2018	us-gaap	Revenue Performance Obligation Description Of Payment Terms RevenuePerformanceObligationDescriptionOfPaymentTerms	Assets recognized as costs to fulfill a contract, which includes internal costs related to pre-placement broking activities, as well as other costs, are amortized on a systematic basis that is consistent with the transfer of the services to which the asset relates, which is generally less than one year.
CY2016	us-gaap	Revenues Revenues	9409000000	USD
CY2017Q1	us-gaap	Revenues Revenues	2381000000	USD
CY2016	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-225000000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-174000000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-121000000	USD
CY2017Q2	us-gaap	Revenues Revenues	2368000000	USD
CY2017Q3	us-gaap	Revenues Revenues	2340000000	USD
CY2017Q4	us-gaap	Revenues Revenues	2909000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	153000000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	353000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1174000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1733000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1733000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	564000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	588000000	USD
CY2016	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	10000000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	18000000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	24000000	USD
CY2016	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-332000000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-227000000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-157000000	USD
CY2016	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-107000000	USD
CY2017	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-53000000	USD
CY2018	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-36000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2945000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1999000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	5417000000	USD
CY2017Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	96000000	USD
CY2018Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	91000000	USD
CY2018Q4	us-gaap	Restructuring And Related Cost Expected Cost Remaining1 RestructuringAndRelatedCostExpectedCostRemaining1	243000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2302000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2093000000	USD
CY2016	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	9409000000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	9998000000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	10770000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	10770000000	USD
CY2017	us-gaap	Revenues Revenues	9998000000	USD
CY2018Q1	us-gaap	Revenues Revenues	3090000000	USD
CY2018Q2	us-gaap	Revenues Revenues	2561000000	USD
CY2018Q3	us-gaap	Revenues Revenues	2349000000	USD
CY2018Q4	us-gaap	Revenues Revenues	2770000000	USD
CY2017Q4	us-gaap	Shortterm Debt Fair Value ShorttermDebtFairValue	301000000	USD
CY2018Q4	us-gaap	Shortterm Debt Fair Value ShorttermDebtFairValue	0	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-125000000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-121000000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-148000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	4583000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	4151000000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6059000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	48000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	55000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	77000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	15000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	11000000	USD
CY2017Q4	us-gaap	Secured Debt Current SecuredDebtCurrent	299000000	USD
CY2018Q4	us-gaap	Secured Debt Current SecuredDebtCurrent	0	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	306000000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	319000000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	338000000	USD
CY2017Q4	us-gaap	Short Term Investments ShortTermInvestments	529000000	USD
CY2018Q4	us-gaap	Short Term Investments ShortTermInvestments	172000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5532000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4648000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4219000000	USD
CY2018Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5155000000	USD
CY2017Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1 StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	5581000000	USD
CY2018Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1 StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	5140000000	USD
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	118300000	shares
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	11000000000	USD
CY2016	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1257000000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2415000000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1454000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	278000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	280000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	279000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	26000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	24000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	6000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	22000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	1000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	12000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	10000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation	4000000	USD
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	247000000	shares
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	25000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	18000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	7000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	6000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	240000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	219000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	228000000	USD
CY2018	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	35000000	USD
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270300000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	260700000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	268100000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	258500000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	245200000	shares
CY2018	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following table summarizes the Company’s Share Repurchase activity (in millions, except per share data):</font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="9" rowspan="1"></td></tr><tr><td style="width:48%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:23%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:23%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="7" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Twelve months ended December 31</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">2018</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">2017 </font><font style="font-family:inherit;font-size:8pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:5pt">(1)</sup></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Shares repurchased</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">10.0</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">18.0</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Average price per share</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">143.94</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">133.67</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Costs recorded to retained earnings</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Total repurchase cost</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1,447</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">2,403</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Additional associated costs</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">7</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">12</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Total costs recorded to retained earnings</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1,454</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">2,415</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:8pt;padding-left:0px;"><font style="font-family:inherit;font-size:8pt;">(1)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">Included in the </font><font style="font-family:inherit;font-size:8pt;">18.0 million</font><font style="font-family:inherit;font-size:8pt;"> shares repurchased during the twelve months ended December 31, 2017 were </font><font style="font-family:inherit;font-size:8pt;">0.1 million</font><font style="font-family:inherit;font-size:8pt;"> shares that did not settle until January 2018. These shares were settled at an average price per share of </font><font style="font-family:inherit;font-size:8pt;">$134.41</font><font style="font-family:inherit;font-size:8pt;"> and total cost of </font><font style="font-family:inherit;font-size:8pt;">$15.9 million</font><font style="font-family:inherit;font-size:8pt;">.</font></div></td></tr></table></div>
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of the accompanying Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of reserves and expenses. These estimates and assumptions are based on management’s best estimates and judgments. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management believes its estimates to be reasonable given the current facts available. Aon adjusts such estimates and assumptions when facts and circumstances dictate. Illiquid credit markets, volatile equity markets, and foreign currency exchange rate movements increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in estimates resulting from continuing changes in the economic environment would, if applicable, be reflected in the Financial Statements in future periods.</font></div></div>

Files In Submission

Name	View Source	Status
0001628280-19-001558-index-headers.html	Edgar Link	pending
0001628280-19-001558-index.html	Edgar Link	pending
0001628280-19-001558.txt	Edgar Link	pending
0001628280-19-001558-xbrl.zip	Edgar Link	pending
aon-20181231.xml	Edgar Link	completed
aon-20181231.xsd	Edgar Link	pending
aon-20181231_cal.xml	Edgar Link	unprocessable
aon-20181231_def.xml	Edgar Link	unprocessable
aon-20181231_lab.xml	Edgar Link	unprocessable
aon-20181231_pre.xml	Edgar Link	unprocessable
aonplc201810-k.htm	Edgar Link	pending
ex212018.htm	Edgar Link	pending
exhibit23.htm	Edgar Link	pending
exhibit3112018.htm	Edgar Link	pending
exhibit3122018.htm	Edgar Link	pending
exhibit3212018.htm	Edgar Link	pending
exhibit3222018.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
g940964a22.jpg	Edgar Link	pending
g940964a23.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
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$AON Aon PLC Stock $aon

2018 Q4 Form 10-K Financial Statement

#000162828019001558 Filed on February 19, 2019

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