$AWK
American Water Works Company, Inc. Stock $awk

$awk Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000141063620000040 Filed on February 18, 2020

Income Statement

Concept	2019 Q4	2018 Q4	2018 Q3
Revenue	$902.0M	$850.0M	$976.0M
YoY Change	6.12%	3.53%	4.27%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$152.0M	$141.0M	$141.0M
YoY Change	7.8%	23.68%	10.16%
% of Gross Profit
Operating Expenses	$635.0M	$602.0M	$641.0M
YoY Change	5.48%	11.48%	27.18%
Operating Profit	$224.0M	$248.0M	$335.0M
YoY Change	-9.68%	-11.74%	-22.45%
Interest Expense	-$98.00M	-$91.00M	-$89.00M
YoY Change	7.69%	9.64%	0.0%
% of Operating Profit	-43.75%	-36.69%	-26.57%
Other Income/Expense, Net	$14.00M	$15.00M	-$80.00M
YoY Change	-6.67%	-600.0%	-13.04%
Pretax Income	$136.0M	$170.0M	$255.0M
YoY Change	-20.0%	-15.42%	-25.0%
Income Tax	$38.00M	$46.00M	$70.00M
% Of Pretax Income	27.94%	27.06%	27.45%
Net Earnings	$98.00M	$112.0M	$187.0M
YoY Change	-12.5%	-11300.0%	-7.88%
Net Earnings / Revenue	10.86%	13.18%	19.16%
Basic Earnings Per Share	$0.54	$0.62	$1.04
Diluted Earnings Per Share	$0.54	$0.62	$1.04
COMMON SHARES
Basic Shares Outstanding	180.8M shares	180.6M shares	181.0M shares
Diluted Shares Outstanding			181.0M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$60.00M	$130.0M	$86.00M
YoY Change	-53.85%	136.36%	-7.53%
Cash & Equivalents	$60.00M	$130.0M	$86.00M
Short-Term Investments
Other Short-Term Assets	$118.0M	$95.00M	$93.00M
YoY Change	24.21%	-15.93%	-38.41%
Inventory	$44.00M	$41.00M	$42.00M
Prepaid Expenses
Receivables	$294.0M	$301.0M	$347.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$1.285B	$781.0M	$800.0M
YoY Change	64.53%	8.47%	-6.98%
LONG-TERM ASSETS
Property, Plant & Equipment	$18.23B	$17.41B	$17.06B
YoY Change	4.73%	7.16%	8.81%
Goodwill	$1.540B	$1.575B	$1.571B
YoY Change	-2.22%	14.21%	14.42%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$207.0M	$63.00M	$76.00M
YoY Change	228.57%	-5.97%	4.11%
Total Long-Term Assets	$21.40B	$20.44B	$20.08B
YoY Change	4.67%	8.95%	8.53%
TOTAL ASSETS
Total Short-Term Assets	$1.285B	$781.0M	$800.0M
Total Long-Term Assets	$21.40B	$20.44B	$20.08B
Total Assets	$22.68B	$21.22B	$20.88B
YoY Change	6.87%	8.94%	7.85%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$203.0M	$175.0M	$141.0M
YoY Change	16.0%	-10.26%	-2.08%
Accrued Expenses	$596.0M	$556.0M	$455.0M
YoY Change	7.19%	-11.75%	-8.63%
Deferred Revenue
YoY Change
Short-Term Debt	$786.0M	$964.0M	$564.0M
YoY Change	-18.46%	6.52%	447.57%
Long-Term Debt Due	$28.00M	$71.00M	$263.0M
YoY Change	-60.56%	-77.95%	-61.72%
Total Short-Term Liabilities	$2.045B	$2.094B	$1.748B
YoY Change	-2.34%	-9.94%	0.06%
LONG-TERM LIABILITIES
Long-Term Debt	$8.644B	$7.576B	$7.577B
YoY Change	14.1%	16.59%	13.41%
Other Long-Term Liabilities	$78.00M	$78.00M	$78.00M
YoY Change	0.0%	18.18%	5.41%
Total Long-Term Liabilities	$78.00M	$78.00M	$78.00M
YoY Change	0.0%	18.18%	5.41%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.045B	$2.094B	$1.748B
Total Long-Term Liabilities	$78.00M	$78.00M	$78.00M
Total Liabilities	$2.123B	$2.172B	$1.826B
YoY Change	-2.26%	-9.16%	0.27%
SHAREHOLDERS EQUITY
Retained Earnings	-$207.0M	-$464.0M	-$432.0M
YoY Change	-55.39%	-35.82%	-24.61%
Common Stock	$6.702B	$6.659B	$6.649B
YoY Change	0.65%	3.5%	3.49%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$338.0M	$297.0M	$297.0M
YoY Change	13.8%	20.24%	20.24%
Treasury Stock Shares	5.091M shares	4.683M shares	4.683M shares
Shareholders Equity	$6.121B	$5.864B	$5.860B
YoY Change
Total Liabilities & Shareholders Equity	$22.68B	$21.22B	$20.88B
YoY Change	6.87%	8.94%	7.85%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$98.00M	$112.0M	$187.0M
YoY Change	-12.5%	-11300.0%	-7.88%
Depreciation, Depletion And Amortization	$152.0M	$141.0M	$141.0M
YoY Change	7.8%	23.68%	10.16%
Cash From Operating Activities	$438.0M	$394.0M	$467.0M
YoY Change	11.17%	-8.16%	-5.85%
INVESTING ACTIVITIES
Capital Expenditures	-$539.0M	-$450.0M	$397.0M
YoY Change	19.78%	-4.26%	9.67%
Acquisitions
YoY Change
Other Investing Activities	-$152.0M	-$41.00M	$1.000M
YoY Change	270.73%	-77.96%	-107.14%
Cash From Investing Activities	-$691.0M	-$491.0M	-$396.0M
YoY Change	40.73%	-25.15%	5.32%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	228.0M	140.0M	-52.00M
YoY Change	62.86%	-25.53%	-39.53%
NET CHANGE
Cash From Operating Activities	438.0M	394.0M	467.0M
Cash From Investing Activities	-691.0M	-491.0M	-396.0M
Cash From Financing Activities	228.0M	140.0M	-52.00M
Net Change In Cash	-25.00M	43.00M	19.00M
YoY Change	-158.14%	-210.26%	-44.12%
FREE CASH FLOW
Cash From Operating Activities	$438.0M	$394.0M	$467.0M
Capital Expenditures	-$539.0M	-$450.0M	$397.0M
Free Cash Flow	$977.0M	$844.0M	$70.00M
YoY Change	15.76%	-6.12%	-47.76%

Facts In Submission

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CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
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CY2019	dei	Document Type DocumentType	10-K
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CY2019	dei	Entity File Number EntityFileNumber	001-34028
CY2019	dei	Entity Registrant Name EntityRegistrantName	AMERICAN WATER WORKS COMPANY, INC.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	51-0063696
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	1 Water Street
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Camden
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	NJ
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CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1170000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1102000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	1253000000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-382000000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-350000000	USD
CY2019	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	280000000	USD
CY2018	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	277000000	USD
CY2017	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	259000000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-34000000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	20000000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	16000000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	57000000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2017	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-342000000	USD
CY2019	awk	Benefit Costs Non Operating Net BenefitCostsNonOperatingNet	-16000000	USD
CY2018	awk	Benefit Costs Non Operating Net BenefitCostsNonOperatingNet	-20000000	USD
CY2017	awk	Benefit Costs Non Operating Net BenefitCostsNonOperatingNet	9000000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4000000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4000000	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-7000000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	33000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	19000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	17000000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-337000000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-315000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-341000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	833000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	787000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	912000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	212000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	222000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	486000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	621000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	565000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	426000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	621000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-2000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	567000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	426000000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.44
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.16
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.39
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.43
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.15
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.38
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	181000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	180000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	178000000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	181000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	180000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	179000000	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	621000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	567000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	426000000	USD
CY2019	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-8000000	USD
CY2018	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-60000000	USD
CY2017	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-7000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-4000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-7000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-7000000	USD
CY2019	awk	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings Pension TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarningsPension	0	USD
CY2018	awk	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings Pension TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarningsPension	-22000000	USD
CY2017	awk	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings Pension TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarningsPension	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-13000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-2000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-6000000	USD
CY2019	awk	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings Hedge TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarningsHedge	0	USD
CY2018	awk	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings Hedge TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarningsHedge	2000000	USD
CY2017	awk	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings Hedge TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarningsHedge	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	45000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	619000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	612000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	433000000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	16000000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	57000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	621000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	565000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	426000000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	582000000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	545000000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	492000000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	208000000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	195000000	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	462000000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	28000000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	33000000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	29000000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-34000000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	20000000	USD
CY2019	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	17000000	USD
CY2018	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	23000000	USD
CY2017	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	57000000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	41000000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-20000000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	54000000	USD
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	25000000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	17000000	USD
CY2017	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-21000000	USD
CY2019	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	31000000	USD
CY2018	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	22000000	USD
CY2017	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	48000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	66000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	25000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	38000000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	72000000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	-22000000	USD
CY2017	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	-64000000	USD
CY2019	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	4000000	USD
CY2018	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	40000000	USD
CY2017	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	22000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1383000000	USD
CY2018	us-gaap	Payments For Proceeds From Removal Costs PaymentsForProceedsFromRemovalCosts	87000000	USD
CY2017	us-gaap	Payments For Proceeds From Removal Costs PaymentsForProceedsFromRemovalCosts	76000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1945000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2036000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1672000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1530000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1358000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1395000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	495000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	526000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1386000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1449000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1654000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1586000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1434000000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	235000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	398000000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	177000000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	48000000	USD
CY2018	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	35000000	USD
CY2017	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	15000000	USD
CY2019	us-gaap	Payments For Proceeds From Removal Costs PaymentsForProceedsFromRemovalCosts	104000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	896000000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-178000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	60000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	55000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	183000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	15000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	16000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	15000000	USD
CY2019	us-gaap	Proceeds From Construction Loans Payable ProceedsFromConstructionLoansPayable	26000000	USD
CY2018	us-gaap	Proceeds From Construction Loans Payable ProceedsFromConstructionLoansPayable	21000000	USD
CY2017	us-gaap	Proceeds From Construction Loans Payable ProceedsFromConstructionLoansPayable	28000000	USD
CY2019	awk	Paymentsof Debt Issuance Costsand Make Whole Premium On Early Debt Redemption PaymentsofDebtIssuanceCostsandMakeWholePremiumOnEarlyDebtRedemption	15000000	USD
CY2018	awk	Paymentsof Debt Issuance Costsand Make Whole Premium On Early Debt Redemption PaymentsofDebtIssuanceCostsandMakeWholePremiumOnEarlyDebtRedemption	22000000	USD
CY2017	awk	Paymentsof Debt Issuance Costsand Make Whole Premium On Early Debt Redemption PaymentsofDebtIssuanceCostsandMakeWholePremiumOnEarlyDebtRedemption	47000000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	353000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	319000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	289000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	36000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	45000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	54000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	494000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	726000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	207000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-68000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	76000000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-16000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	159000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	83000000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	99000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	91000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	159000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	83000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	383000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	332000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	338000000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	12000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	38000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	30000000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	235000000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	181000000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	204000000	USD
CY2019	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2018	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2017	us-gaap	Stock Issued1 StockIssued1	33000000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	5218000000	USD
CY2017Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	21000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	426000000	USD
CY2017	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	8000000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	7000000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	15000000	USD
CY2017	awk	Acquisition Financed By Treasury Stock Value AcquisitionFinancedByTreasuryStockValue	34000000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	54000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7000000	USD
CY2017	us-gaap	Dividends Cash DividendsCash	297000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	5385000000	USD
CY2018Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	20000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	567000000	USD
CY2018	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	8000000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	8000000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	20000000	USD
CY2018	us-gaap	Stock Issued During Period Shares Acquisitions StockIssuedDuringPeriodSharesAcquisitions	2300000	shares
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	183000000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	45000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	45000000	USD
CY2018	us-gaap	Dividends Cash DividendsCash	327000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	5864000000	USD
CY2019Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	-2000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	621000000	USD
CY2019	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	7000000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	10000000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	21000000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	36000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2000000	USD
CY2019	us-gaap	Dividends Cash DividendsCash	362000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	6121000000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	1000000	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-bottom:4px;padding-top:24px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</span></div><div style="line-height:120%;padding-bottom:24px;padding-top:4px;text-align:justify;text-indent:37px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires that management make estimates, assumptions and judgments that could affect the Company’s financial condition, results of operations and cash flows. Actual results could differ from these estimates, assumptions and judgments. The Company considers its critical accounting estimates to include (i) the application of regulatory accounting principles and the related determination and estimation of regulatory assets and liabilities, (ii) revenue recognition and the estimates used in the calculation of unbilled revenue, (iii) accounting for income taxes, (iv) benefit plan assumptions and (v) the estimates and judgments used in determining loss contingencies. The Company’s critical accounting estimates that are particularly sensitive to change in the near term are amounts reported for regulatory assets and liabilities, income taxes, benefit plan assumptions and contingency-related obligations.</span></div>
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	60000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	130000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	31000000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	28000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	0	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	91000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	159000000	USD
CY2019Q4	awk	Repayment Of Advances For Construction RepaymentOfAdvancesForConstruction	25000000	USD
CY2018Q4	awk	Repayment Of Advances For Construction RepaymentOfAdvancesForConstruction	23000000	USD
CY2019	awk	Amortization Of Contributions In Aid Of Construction AmortizationOfContributionsInAidOfConstruction	29000000	USD
CY2018	awk	Amortization Of Contributions In Aid Of Construction AmortizationOfContributionsInAidOfConstruction	28000000	USD
CY2017	awk	Amortization Of Contributions In Aid Of Construction AmortizationOfContributionsInAidOfConstruction	27000000	USD
CY2019	awk	Contractwith Customer Payment Term From Billing Period ContractwithCustomerPaymentTermFromBillingPeriod	P30D
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	1000000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	2000000	USD
CY2018Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	4000000	USD
CY2019	us-gaap	Derivatives Reporting Of Derivative Activity DerivativesReportingOfDerivativeActivity	<div style="line-height:120%;padding-bottom:4px;padding-top:24px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Derivative Financial Instruments</span></div><div style="line-height:120%;padding-bottom:16px;padding-top:4px;text-align:justify;text-indent:37px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company uses derivative financial instruments for purposes of hedging exposures to fluctuations in interest rates. These derivative contracts are entered into for periods consistent with the related underlying exposures and do not constitute positions independent of those exposures. The Company does not enter into derivative contracts for speculative purposes and does not use leveraged instruments.</span></div><div style="line-height:120%;padding-bottom:16px;padding-top:16px;text-align:justify;text-indent:37px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">All derivatives are recognized on the balance sheet at fair value. On the date the derivative contract is entered into, the Company may designate the derivative as a hedge of the fair value of a recognized asset or liability (fair-value hedge) or a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized asset or liability (cash-flow hedge).</span></div><div style="line-height:120%;padding-bottom:16px;padding-top:16px;text-align:justify;text-indent:37px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Changes in the fair value of a fair-value hedge, along with the gain or loss on the underlying hedged item, are recorded in current-period earnings. The gains and losses on the effective portion of cash-flow hedges are recorded in other comprehensive income, until earnings are affected by the variability of cash flows. Any ineffective portion of designated cash-flow hedges is recognized in current-period earnings.</span></div>Cash flows from derivative contracts are included in net cash provided by operating activities on the Consolidated Statements of Cash Flows.
CY2019	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="line-height:120%;padding-bottom:4px;padding-top:24px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Reclassifications</span></div><div style="line-height:120%;padding-bottom:24px;padding-top:4px;text-align:justify;text-indent:37px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Certain reclassifications have been made to prior periods in the Consolidated Financial Statements and Notes to conform to the current presentation.</span></div>
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3587000000	USD
CY2019	us-gaap	Other Operating Income OtherOperatingIncome	23000000	USD
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	3610000000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	14000000	USD
CY2019	awk	Contractwith Customer Asset Additions ContractwithCustomerAssetAdditions	27000000	USD
CY2019	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	28000000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	13000000	USD
CY2018Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	20000000	USD
CY2019	awk	Contractwith Customer Liability Additions ContractwithCustomerLiabilityAdditions	62000000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	55000000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	27000000	USD
CY2019Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	14000000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment	456000000	USD
CY2019Q4	awk	Disposal Group Including Discontinued Operation Regulatory Assets DisposalGroupIncludingDiscontinuedOperationRegulatoryAssets	55000000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Goodwill1 DisposalGroupIncludingDiscontinuedOperationGoodwill1	39000000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Other Assets DisposalGroupIncludingDiscontinuedOperationOtherAssets	2000000	USD
CY2019Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	566000000	USD
CY2019Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	24000000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Liabilities DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities	67000000	USD
CY2019Q4	awk	Disposal Group Including Discontinued Operation Regulatory Liabilities DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilities	37000000	USD
CY2019Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	128000000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	801000000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	593000000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	23720000000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	22486000000	USD
CY2019Q4	awk	Public Non Utilities Property Plant And Equipment Plant For Internal Operations PublicNonUtilitiesPropertyPlantAndEquipmentPlantForInternalOperations	226000000	USD
CY2018Q4	awk	Public Non Utilities Property Plant And Equipment Plant For Internal Operations PublicNonUtilitiesPropertyPlantAndEquipmentPlantForInternalOperations	718000000	USD
CY2019	awk	Property Plant And Equipment Weighted Average Useful Life PropertyPlantAndEquipmentWeightedAverageUsefulLife	P6Y
CY2019Q4	awk	Disposal Group Including Discontinued Operation Public Non Utilities Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPublicNonUtilitiesPropertyPlantAndEquipment	5000000	USD
CY2018Q4	awk	Disposal Group Including Discontinued Operation Public Non Utilities Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPublicNonUtilitiesPropertyPlantAndEquipment	0	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	23941000000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	23204000000	USD
CY2019	us-gaap	Depreciation Depreciation	508000000	USD
CY2018	us-gaap	Depreciation Depreciation	497000000	USD
CY2017	us-gaap	Depreciation Depreciation	460000000	USD
CY2019	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0296
CY2018	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0309
CY2017	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0307
CY2019	us-gaap	Investment Tax Credit InvestmentTaxCredit	164000000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	45000000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	42000000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	40000000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	28000000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	33000000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	29000000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	32000000	USD
CY2018	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	34000000	USD
CY2017	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	30000000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	0	USD
CY2018	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	4000000	USD
CY2017	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	3000000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	41000000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	45000000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	42000000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1128000000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1156000000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1806000000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1907000000	USD
CY2018Q4	awk	Number Of Proceedings NumberOfProceedings	14	state
CY2019Q4	awk	Number Of Proceedings Numberof States Effected NumberOfProceedingsNumberofStatesEffected	11	state
CY2019Q4	awk	Number Of Proceedings Number Of States Effected Offset Additional Capital Investment NumberOfProceedingsNumberOfStatesEffectedOffsetAdditionalCapitalInvestment	1	state
CY2019Q4	awk	Number Of Proceedings Numberof States Effected NumberOfProceedingsNumberofStatesEffected	11	state
CY2019Q4	awk	Number Of Proceedings Number Of States Effected Reduction Of Certain Regulatory Assets NumberOfProceedingsNumberOfStatesEffectedReductionOfCertainRegulatoryAssets	1	state
CY2019Q4	awk	Numberof Proceedings Pending NumberofProceedingsPending	2	state
CY2019Q4	awk	Numberof Proceedings Numberof Subsidiaries Effected Amortizationof Eadit NumberofProceedingsNumberofSubsidiariesEffectedAmortizationofEADIT	6	state
CY2019Q4	awk	Number Of Proceedings Number Of States Effected Offset Additional Capital Investment NumberOfProceedingsNumberOfStatesEffectedOffsetAdditionalCapitalInvestment	1	state
CY2019Q4	awk	Numberof Proceedings Numberof Subsidiaries Effected Pending Amortizationof Eadit NumberofProceedingsNumberofSubsidiariesEffectedPendingAmortizationofEADIT	8	state
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	3819000000	USD
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	2440000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	1379000000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	249000000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	249000000	USD
CY2018	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-53000000	USD
CY2018	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-53000000	USD
CY2018Q4	us-gaap	Goodwill Gross GoodwillGross	4068000000	USD
CY2018Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	2493000000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	1575000000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	3000000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	3000000	USD
CY2019	awk	Goodwill Writtenoff Relatedto Saleof Business Unit Net GoodwillWrittenoffRelatedtoSaleofBusinessUnitNet	-38000000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Goodwill1 DisposalGroupIncludingDiscontinuedOperationGoodwill1	39000000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Goodwill1 DisposalGroupIncludingDiscontinuedOperationGoodwill1	39000000	USD
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	3941000000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	2440000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1501000000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	12000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	10000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	9000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	6000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	5000000	USD
CY2019	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	400000	shares
CY2019	awk	Goodwill Writtenoff Relatedto Saleof Business Unit Net GoodwillWrittenoffRelatedtoSaleofBusinessUnitNet	-38000000	USD
CY2018Q3	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	4000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	99000000	USD
CY2019	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	8000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	91000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	15000000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14000000	USD
CY2019	awk	Finite Lived Intangible Assets Accumulated Amortization Impairmentof Intangible Assets FiniteLivedIntangibleAssetsAccumulatedAmortizationImpairmentofIntangibleAssets	5000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	24000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	84000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	67000000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14000000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	12000000	USD
CY2018	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	600000	shares
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	36000000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	45000000	USD
CY2019Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	5100000	shares
CY2018	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	58000000	USD
CY2018	awk	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarnings	-20000000	USD
CY2018	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-7000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	45000000	USD
CY2019	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-5000000	USD
CY2019	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-3000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	353000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	319000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	289000000	USD
CY2019Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.50
CY2018Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.455
CY2017Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.415
CY2019Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.50
CY2018Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.455
CY2017Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.415
CY2019Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.50
CY2018Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.455
CY2017Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.415
CY2019Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.455
CY2018Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.415
CY2017Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.375
CY2019Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.50
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4000000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	13000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	12000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7000000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	21000000	USD
CY2018Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	16000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	28000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	71000000	USD
CY2019Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	8644000000	USD
CY2018Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	7576000000	USD
CY2019Q4	us-gaap	Longterm Debt Percentage Bearing Variable Interest Amount LongtermDebtPercentageBearingVariableInterestAmount	3000000	USD
CY2018Q4	us-gaap	Longterm Debt Percentage Bearing Variable Interest Amount LongtermDebtPercentageBearingVariableInterestAmount	3000000	USD
CY2019Q4	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.61
CY2019Q4	awk	Redeemable Debt Amount Outstanding RedeemableDebtAmountOutstanding	877000000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	8692000000	USD
CY2018Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	7656000000	USD
CY2019Q4	awk	Debt Instrument Unamortized Discount Premium Fair Value Net DebtInstrumentUnamortizedDiscountPremiumFairValueNet	1000000	USD
CY2018Q4	awk	Debt Instrument Unamortized Discount Premium Fair Value Net DebtInstrumentUnamortizedDiscountPremiumFairValueNet	7000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	28000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	310000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	14000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	159000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	473000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	7708000000	USD
CY2017	us-gaap	Interest And Other Income InterestAndOtherIncome	14000000	USD
CY2019Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0245
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1530000000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	15000000	USD
CY2019	us-gaap	Interest And Other Income InterestAndOtherIncome	4000000	USD
CY2018	us-gaap	Interest And Other Income InterestAndOtherIncome	11000000	USD
CY2017	awk	Gross Receipts And Franchise Tax GrossReceiptsAndFranchiseTax	110000000	USD
CY2019	awk	Property And Capital Stock Tax PropertyAndCapitalStockTax	124000000	USD
CY2018	awk	Property And Capital Stock Tax PropertyAndCapitalStockTax	120000000	USD
CY2017	awk	Property And Capital Stock Tax PropertyAndCapitalStockTax	105000000	USD
CY2019Q4	awk	Required Ratio Of Indebtedness To Net Capital1 RequiredRatioOfIndebtednessToNetCapital1	0.70
CY2019	awk	Gross Receipts And Franchise Tax GrossReceiptsAndFranchiseTax	110000000	USD
CY2018	awk	Gross Receipts And Franchise Tax GrossReceiptsAndFranchiseTax	112000000	USD
CY2019	awk	Payroll Tax PayrollTax	35000000	USD
CY2018	awk	Payroll Tax PayrollTax	33000000	USD
CY2017	awk	Payroll Tax PayrollTax	31000000	USD
CY2019	us-gaap	Taxes Other TaxesOther	11000000	USD
CY2018	us-gaap	Taxes Other TaxesOther	12000000	USD
CY2017	us-gaap	Taxes Other TaxesOther	13000000	USD
CY2019	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	280000000	USD
CY2018	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	277000000	USD
CY2017	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	259000000	USD
CY2019	us-gaap	Deferred Federal State And Local Tax Expense Benefit DeferredFederalStateAndLocalTaxExpenseBenefit	208000000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4000000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	26000000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	25000000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1000000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1000000	USD
CY2019	us-gaap	Current Federal State And Local Tax Expense Benefit CurrentFederalStateAndLocalTaxExpenseBenefit	4000000	USD
CY2018	us-gaap	Current Federal State And Local Tax Expense Benefit CurrentFederalStateAndLocalTaxExpenseBenefit	27000000	USD
CY2017	us-gaap	Current Federal State And Local Tax Expense Benefit CurrentFederalStateAndLocalTaxExpenseBenefit	24000000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	54000000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	33000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	50000000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	155000000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	163000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	413000000	USD
CY2019	awk	Amortization Of Deferred Investment Tax Credits AmortizationOfDeferredInvestmentTaxCredits	-1000000	USD
CY2018	awk	Amortization Of Deferred Investment Tax Credits AmortizationOfDeferredInvestmentTaxCredits	-1000000	USD
CY2017	awk	Amortization Of Deferred Investment Tax Credits AmortizationOfDeferredInvestmentTaxCredits	-1000000	USD
CY2018	us-gaap	Deferred Federal State And Local Tax Expense Benefit DeferredFederalStateAndLocalTaxExpenseBenefit	195000000	USD
CY2017	us-gaap	Deferred Federal State And Local Tax Expense Benefit DeferredFederalStateAndLocalTaxExpenseBenefit	462000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	212000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	222000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	486000000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.054
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.055
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.054
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.015
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.137
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.010
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.002
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.008
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.254
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.282
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.533
CY2019	awk	Utilization Of Net Operating Losses Due To Tax Cuts Jobs Act2017 UtilizationOfNetOperatingLossesDueToTaxCutsJobsAct2017	0.80
CY2017	awk	Tax Cutsand Jobs Actof2017 Deferred Income Tax Expense Benefit TaxCutsandJobsActof2017DeferredIncomeTaxExpenseBenefit	125000000	USD
CY2017	awk	Tax Cutsand Jobs Actof2017 Increase Decrease In Deferred Tax Liability TaxCutsandJobsActof2017IncreaseDecreaseInDeferredTaxLiability	-1390000000	USD
CY2017	awk	Tax Cutsand Jobs Actof2017 Increase Decrease In Regulatory Liability TaxCutsandJobsActof2017IncreaseDecreaseInRegulatoryLiability	1510000000	USD
CY2018Q4	awk	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings Hedge TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarningsHedge	2000000	USD
CY2018Q4	awk	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings Pension TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarningsPension	-22000000	USD
CY2019Q4	awk	Deferred Tax Assets Advances And Contributions DeferredTaxAssetsAdvancesAndContributions	410000000	USD
CY2018Q4	awk	Deferred Tax Assets Advances And Contributions DeferredTaxAssetsAdvancesAndContributions	402000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	136000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	131000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	335000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	339000000	USD
CY2019Q4	awk	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions And Other Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits	94000000	USD
CY2018Q4	awk	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions And Other Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndOtherPostretirementBenefits	91000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	151000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	44000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1126000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1007000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	21000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	14000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1105000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	993000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2760000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2537000000	USD
CY2019Q4	awk	Deferred Tax Liabilities Deferred Pension And Other Postretirement Benefits DeferredTaxLiabilitiesDeferredPensionAndOtherPostretirementBenefits	77000000	USD
CY2018Q4	awk	Deferred Tax Liabilities Deferred Pension And Other Postretirement Benefits DeferredTaxLiabilitiesDeferredPensionAndOtherPostretirementBenefits	77000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	207000000	USD
CY2017	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	7000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	13000000	USD
CY2018	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	1000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	97000000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3044000000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2711000000	USD
CY2019Q4	awk	Deferred Income Tax Liabilities Assets Held For Sale DeferredIncomeTaxLiabilitiesAssetsHeldForSale	-67000000	USD
CY2018Q4	awk	Deferred Income Tax Liabilities Assets Held For Sale DeferredIncomeTaxLiabilitiesAssetsHeldForSale	0	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	1872000000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	1718000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	106000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	13000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	22000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	97000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	17000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	4000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	110000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	12000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	14000000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	7000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	21000000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.0525
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Plan Assets DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets	1499000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	2018000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	2161000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	1892000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Plan Assets DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets	1748000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	1768000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	1748000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	1499000000	USD
CY2019	awk	Reduction Of Expected Future Service Of Plan Participants ReductionOfExpectedFutureServiceOfPlanParticipants	0.10
CY2019	awk	Cumulative Gains Losses As Percentage Of Benefit Obligations Or Plan Assets CumulativeGainsLossesAsPercentageOfBenefitObligationsOrPlanAssets	0.10
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.0525
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	12000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	12000000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	13000000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.0525
CY2019	awk	Defined Contribution Plan Additional Base Pay Cost DefinedContributionPlanAdditionalBasePayCost	13000000	USD
CY2018	awk	Defined Contribution Plan Additional Base Pay Cost DefinedContributionPlanAdditionalBasePayCost	11000000	USD
CY2017	awk	Defined Contribution Plan Additional Base Pay Cost DefinedContributionPlanAdditionalBasePayCost	9000000	USD
CY2019Q4	awk	Estimated Capital Expenditures Under Legal And Binding Contractual Obligations EstimatedCapitalExpendituresUnderLegalAndBindingContractualObligations	579000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	65000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	65000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	65000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	63000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	49000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	605000000	USD
CY2019Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	17000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	8664000000	USD
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	9770000000	USD
CY2018Q4	awk	Preferred Stocks With Mandatory Redemption Requirements Carrying Amount PreferredStocksWithMandatoryRedemptionRequirementsCarryingAmount	8000000	USD
CY2018Q4	us-gaap	Mandatorily Redeemable Preferred Stock Fair Value Disclosure MandatorilyRedeemablePreferredStockFairValueDisclosure	9000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	7638000000	USD
CY2018Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	7921000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	31000000	USD
CY2019Q4	awk	Rabbi Trust Investments RabbiTrustInvestments	17000000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	14000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	621000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	567000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	426000000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	181000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	180000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	178000000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1000000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	181000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	180000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	179000000	shares
CY2019Q4	awk	Preferred Stocks With Mandatory Redemption Requirements Carrying Amount PreferredStocksWithMandatoryRedemptionRequirementsCarryingAmount	7000000	USD
CY2019Q4	us-gaap	Mandatorily Redeemable Preferred Stock Fair Value Disclosure MandatorilyRedeemablePreferredStockFairValueDisclosure	9000000	USD
CY2019Q4	awk	Deposit Assets Fair Value DepositAssetsFairValue	3000000	USD
CY2019Q4	awk	Other Investments Fair Value Disclosure OtherInvestmentsFairValueDisclosure	8000000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	59000000	USD
CY2019Q4	us-gaap	Fair Value Liabilities Measured On Recurring Basis Obligations FairValueLiabilitiesMeasuredOnRecurringBasisObligations	21000000	USD
CY2019Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	21000000	USD
CY2019Q4	us-gaap	Fair Value Net Asset Liability FairValueNetAssetLiability	38000000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	29000000	USD
CY2018Q4	awk	Rabbi Trust Investments RabbiTrustInvestments	15000000	USD
CY2018Q4	awk	Deposit Assets Fair Value DepositAssetsFairValue	3000000	USD
CY2018Q4	awk	Other Investments Fair Value Disclosure OtherInvestmentsFairValueDisclosure	3000000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	50000000	USD
CY2018Q4	us-gaap	Fair Value Liabilities Measured On Recurring Basis Obligations FairValueLiabilitiesMeasuredOnRecurringBasisObligations	17000000	USD
CY2018Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	31000000	USD
CY2018Q4	us-gaap	Fair Value Net Asset Liability FairValueNetAssetLiability	19000000	USD
CY2019Q4	us-gaap	Restricted Investments RestrictedInvestments	1000000	USD
CY2018Q4	us-gaap	Restricted Investments RestrictedInvestments	1000000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	147000000	USD
CY2018Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	147000000	USD
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CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	29000000	USD
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CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	121000000	USD
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P6Y
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P19Y
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.12
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.04
CY2019Q4	awk	Lessee Operatingand Financing Lease Liability Payments Due Year Two LesseeOperatingandFinancingLeaseLiabilityPaymentsDueYearTwo	13000000	USD
CY2019Q4	awk	Lessee Operatingand Financing Lease Liability Payments Due Next Twelve Months LesseeOperatingandFinancingLeaseLiabilityPaymentsDueNextTwelveMonths	14000000	USD
CY2019Q4	awk	Lessee Operatingand Financing Lease Liability Payments Due Year Three LesseeOperatingandFinancingLeaseLiabilityPaymentsDueYearThree	11000000	USD
CY2019Q4	awk	Lessee Operatingand Financing Lease Liability Payments Due Year Four LesseeOperatingandFinancingLeaseLiabilityPaymentsDueYearFour	7000000	USD
CY2019Q4	awk	Lessee Operatingand Financing Lease Liability Payments Due Year Five LesseeOperatingandFinancingLeaseLiabilityPaymentsDueYearFive	7000000	USD
CY2019Q4	awk	Lessee Operatingand Financing Lease Liability Payments Dueafter Year Five LesseeOperatingandFinancingLeaseLiabilityPaymentsDueafterYearFive	100000000	USD
CY2019Q4	awk	Lessee Operatingand Financing Lease Liability Payments Due LesseeOperatingandFinancingLeaseLiabilityPaymentsDue	152000000	USD
CY2019Q4	awk	Lessee Operatingand Financing Lease Liability Undiscounted Excess Amount LesseeOperatingandFinancingLeaseLiabilityUndiscountedExcessAmount	53000000	USD
CY2019Q4	awk	Operatingand Financing Lease Liability OperatingandFinancingLeaseLiability	99000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	17000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	15000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	12000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	11000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	6000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	80000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	141000000	USD
CY2019	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	3610000000	USD
CY2019	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	582000000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	2440000000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-382000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	833000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	212000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	621000000	USD
CY2019Q4	us-gaap	Assets Assets	22682000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1654000000	USD
CY2018	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	3440000000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	545000000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	57000000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	2338000000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-350000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	787000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	222000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	567000000	USD
CY2018Q4	us-gaap	Assets Assets	21223000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1586000000	USD
CY2017	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	3357000000	USD
CY2017	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	492000000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	2104000000	USD
CY2017	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-342000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	912000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	486000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	426000000	USD
CY2017Q4	us-gaap	Assets Assets	19482000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1434000000	USD
CY2019Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	813000000	USD
CY2019Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	882000000	USD
CY2019Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1013000000	USD
CY2019Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	902000000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	238000000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	302000000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	406000000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	224000000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	113000000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	170000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	240000000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	98000000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.94
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.33
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.54
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.94
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
CY2018Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	761000000	USD
CY2018Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	853000000	USD
CY2018Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	976000000	USD
CY2018Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	850000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	217000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	302000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	335000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	248000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	106000000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	162000000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	187000000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	112000000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.04
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.59
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.91
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.04
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62

Files In Submission

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American Water Works Company, Inc. Stock $awk

2019 Q4 Form 10-K Financial Statement

#000141063620000040 Filed on February 18, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AWK American Water Works Company, Inc. Stock $awk

2019 Q4 Form 10-K Financial Statement

#000141063620000040 Filed on February 18, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AWK
American Water Works Company, Inc. Stock $awk