$CSX
CSX CORP Stock $csx

$csx Overview Financials Valuation SEC Filings Company Website

2018 Form 10-K Financial Statement

#000027794819000011 Filed on February 06, 2019

Income Statement

Concept	2018	2017 Q4	2017 Q3
Revenue	$12.25B	$2.863B	$2.743B
YoY Change	7.38%	-5.73%	1.22%
Cost Of Revenue	$3.013B	$783.0M	$721.0M
YoY Change	1.21%	10.28%	5.87%
Gross Profit	$9.237B	$2.080B	$2.022B
YoY Change	9.56%	-10.61%	-0.34%
Gross Profit Margin	75.4%	72.65%	73.71%
Selling, General & Admin	$3.133B	$844.0M	$814.0M
YoY Change	-7.17%	-13.44%	-6.11%
% of Gross Profit	33.92%	40.58%	40.26%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.300B	$337.0M	$331.0M
YoY Change	-1.14%	-3.16%	3.12%
% of Gross Profit	14.07%	16.2%	16.37%
Operating Expenses	$7.381B	$1.181B	$1.875B
YoY Change	-3.99%	-10.73%	0.32%
Operating Profit	$4.869B	$1.126B	$868.0M
YoY Change	30.89%	12.15%	3.21%
Interest Expense	$32.00M	$79.00M	$132.0M
YoY Change	-94.14%	-150.64%	-5.04%
% of Operating Profit	0.66%	7.02%	15.21%
Other Income/Expense, Net	$74.00M	$34.00M	$14.00M
YoY Change	39.62%	88.89%	7.69%
Pretax Income	$4.300B	$983.0M	$750.0M
YoY Change	36.86%	30.89%	4.9%
Income Tax	$995.0M	$349.0M	$291.0M
% Of Pretax Income	23.14%	35.5%	38.8%
Net Earnings	$3.309B	$4.140B	$459.0M
YoY Change	-39.52%	803.93%	0.88%
Net Earnings / Revenue	27.01%	144.6%	16.73%
Basic Earnings Per Share	$3.86	$4.63	$0.51
Diluted Earnings Per Share	$3.84	$4.62	$0.51
COMMON SHARES
Basic Shares Outstanding	857.0M shares		902.0M shares
Diluted Shares Outstanding	861.0M shares		906.0M shares

Balance Sheet

Concept	2018	2017 Q4	2017 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.111B	$419.0M	$704.0M
YoY Change	165.16%	-58.92%	-6.75%
Cash & Equivalents	$858.0M	$401.0M	$591.0M
Short-Term Investments	$253.0M	$18.00M	$113.0M
Other Short-Term Assets	$181.0M	$154.0M	$95.00M
YoY Change	17.53%	26.23%	10.47%
Inventory	$263.0M	$372.0M	$392.0M
Prepaid Expenses
Receivables	$1.010B	$970.0M	$981.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$2.565B	$1.915B	$2.172B
YoY Change	33.94%	-23.0%	0.42%
LONG-TERM ASSETS
Property, Plant & Equipment	$32.00B	$31.76B	$31.58B
YoY Change	0.74%	1.97%	2.59%
Goodwill		$63.00M
YoY Change		0.0%
Intangibles
YoY Change
Long-Term Investments	$1.779B	$1.686B	$1.506B
YoY Change	5.52%	15.56%	5.09%
Other Assets	$387.0M	$374.0M	$316.0M
YoY Change	3.48%	17.61%	4.29%
Total Long-Term Assets	$34.16B	$33.82B	$33.40B
YoY Change	1.01%	2.72%	2.72%
TOTAL ASSETS
Total Short-Term Assets	$2.565B	$1.915B	$2.172B
Total Long-Term Assets	$34.16B	$33.82B	$33.40B
Total Assets	$36.73B	$35.74B	$35.57B
YoY Change	2.77%	0.92%	2.57%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$949.0M	$847.0M	$905.0M
YoY Change	12.04%	5.09%	5.36%
Accrued Expenses	$550.0M	$602.0M	$601.0M
YoY Change	-8.64%	10.46%	33.56%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$18.00M	$19.00M	$19.00M
YoY Change	-5.26%	-94.26%	-96.99%
Total Short-Term Liabilities	$1.915B	$1.894B	$2.075B
YoY Change	1.11%	-7.16%	-8.31%
LONG-TERM LIABILITIES
Long-Term Debt	$14.74B	$11.79B	$11.79B
YoY Change	25.01%	7.55%	19.22%
Other Long-Term Liabilities	$805.0M	$650.0M	$766.0M
YoY Change	-12.12%	-24.68%	-30.68%
Total Long-Term Liabilities	$15.54B	$650.0M	$766.0M
YoY Change	22.34%	-24.68%	-30.68%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.915B	$1.894B	$2.075B
Total Long-Term Liabilities	$15.54B	$650.0M	$766.0M
Total Liabilities	$24.17B	$21.02B	$24.67B
YoY Change	14.89%	-11.39%	7.21%
SHAREHOLDERS EQUITY
Retained Earnings		$14.08B	$10.33B
YoY Change		25.16%	-8.07%
Common Stock		$1.107B	$1.121B
YoY Change		3.85%	5.56%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$12.56B	$14.71B	$10.89B
YoY Change
Total Liabilities & Shareholders Equity	$36.73B	$35.74B	$35.57B
YoY Change	2.77%	0.92%	2.57%

Cashflow Statement

Concept	2018	2017 Q4	2017 Q3
OPERATING ACTIVITIES
Net Income	$3.309B	$4.140B	$459.0M
YoY Change	-39.52%	803.93%	0.88%
Depreciation, Depletion And Amortization	$1.300B	$337.0M	$331.0M
YoY Change	-1.14%	-3.16%	3.12%
Cash From Operating Activities	$4.641B	$611.0M	$1.295B
YoY Change	33.67%	10.49%	44.53%
INVESTING ACTIVITIES
Capital Expenditures	$1.745B	-$578.0M	-$507.0M
YoY Change	-14.46%	-28.47%	-3.24%
Acquisitions
YoY Change
Other Investing Activities	$27.00M	$162.0M	$395.0M
YoY Change	-172.97%	-267.01%	252.68%
Cash From Investing Activities	-$1.684B	-$416.0M	-$112.0M
YoY Change	12.64%	-54.03%	-72.82%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$4.671B		$1.000B
YoY Change	137.11%		280.23%
Debt Paid & Issued, Net	$19.00M
YoY Change	-94.29%
Cash From Financing Activities	-$2.500B	-385.0M	-1.212B
YoY Change	14.73%	-209.38%	171.14%
NET CHANGE
Cash From Operating Activities	$4.641B	611.0M	1.295B
Cash From Investing Activities	-$1.684B	-416.0M	-112.0M
Cash From Financing Activities	-$2.500B	-385.0M	-1.212B
Net Change In Cash	$457.0M	-190.0M	-29.00M
YoY Change	-326.24%		-178.38%
FREE CASH FLOW
Cash From Operating Activities	$4.641B	$611.0M	$1.295B
Capital Expenditures	$1.745B	-$578.0M	-$507.0M
Free Cash Flow	$2.896B	$1.189B	$1.802B
YoY Change	102.23%	-12.64%	26.9%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018	csx	Cash Equivalents Maximum Maturity Period CashEquivalentsMaximumMaturityPeriod	P3M
CY2018Q4	csx	Casualty And Catastrophic Property Deductible CasualtyAndCatastrophicPropertyDeductible	50000000	USD
CY2018Q4	csx	Casualty And Non Catastrophic Property Deductible CasualtyAndNonCatastrophicPropertyDeductible	25000000	USD
CY2018	csx	Contractwith Customer Timingof Satisfactionof Performance Obligation Payment Period ContractwithCustomerTimingofSatisfactionofPerformanceObligationPaymentPeriod	P15D
CY2018	csx	Cost Method Investment Maximum Percentage For Treatment CostMethodInvestmentMaximumPercentageForTreatment	0.20
CY2017Q4	csx	Defined Benefit Plan Fair Valueof Plan Assets Excluding Assets Measuredat Nav DefinedBenefitPlanFairValueofPlanAssetsExcludingAssetsMeasuredatNAV	1764000000	USD
CY2018Q4	csx	Defined Benefit Plan Fair Valueof Plan Assets Excluding Assets Measuredat Nav DefinedBenefitPlanFairValueofPlanAssetsExcludingAssetsMeasuredatNAV	1461000000	USD
CY2018	csx	Defined Benefit Plan Service Cost Capitalized DefinedBenefitPlanServiceCostCapitalized	4000000	USD
CY2018	csx	Defined Benefit Special Termination Benefits Curtailments DefinedBenefitSpecialTerminationBenefitsCurtailments	56000000	USD
CY2017Q4	csx	Effective Income Tax Rate Reconciliation Changein Enacted Tax Rate Amount Per Share EffectiveIncomeTaxRateReconciliationChangeinEnactedTaxRateAmountPerShare	-3.81
CY2016	csx	Effective Income Tax Rate Reconciliation Federal Effective Rate Percent EffectiveIncomeTaxRateReconciliationFederalEffectiveRatePercent	0.350
CY2017	csx	Effective Income Tax Rate Reconciliation Federal Effective Rate Percent EffectiveIncomeTaxRateReconciliationFederalEffectiveRatePercent	0.350
CY2018	csx	Effective Income Tax Rate Reconciliation Federal Effective Rate Percent EffectiveIncomeTaxRateReconciliationFederalEffectiveRatePercent	0.210
CY2017Q4	csx	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	3600000000	USD
CY2017	csx	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	3600000000	USD
CY2017Q4	csx	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount Per Share EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017AmountPerShare	3.91
CY2017	csx	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount Per Share EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017AmountPerShare	3.91
CY2016	csx	Equipmentand Other Rents EquipmentandOtherRents	465000000	USD
CY2017	csx	Equipmentand Other Rents EquipmentandOtherRents	429000000	USD
CY2018	csx	Equipmentand Other Rents EquipmentandOtherRents	395000000	USD
CY2016	csx	Incomefrom Real Estate Operations IncomefromRealEstateOperations	27000000	USD
CY2017	csx	Incomefrom Real Estate Operations IncomefromRealEstateOperations	0	USD
CY2018	csx	Incomefrom Real Estate Operations IncomefromRealEstateOperations	0	USD
CY2018	csx	Lease Term Maximum LeaseTermMaximum	P50Y
CY2018Q4	csx	Net Lease Commitments Due Current Year NetLeaseCommitmentsDueCurrentYear	55000000	USD
CY2018Q4	csx	Net Lease Commitments Due In Five Years NetLeaseCommitmentsDueInFiveYears	40000000	USD
CY2018Q4	csx	Net Lease Commitments Due In Four Years NetLeaseCommitmentsDueInFourYears	46000000	USD
CY2018Q4	csx	Net Lease Commitments Due In Three Years NetLeaseCommitmentsDueInThreeYears	50000000	USD
CY2018Q4	csx	Net Lease Commitments Due In Two Years NetLeaseCommitmentsDueInTwoYears	56000000	USD
CY2018Q4	csx	Net Lease Commitments Thereafter NetLeaseCommitmentsThereafter	1309000000	USD
CY2018Q4	csx	Net Lease Commitments Total NetLeaseCommitmentsTotal	1556000000	USD
CY2016	csx	Number Of Locomotives Under Long Term Maintenance Plan NumberOfLocomotivesUnderLongTermMaintenancePlan	2243	locomotive
CY2017	csx	Number Of Locomotives Under Long Term Maintenance Plan NumberOfLocomotivesUnderLongTermMaintenancePlan	2062	locomotive
CY2018	csx	Number Of Locomotives Under Long Term Maintenance Plan NumberOfLocomotivesUnderLongTermMaintenancePlan	1910	locomotive
CY2018Q4	csx	Number Of Short Line And Regional Railroads Served NumberOfShortLineAndRegionalRailroadsServed	230	railroad
CY2018	csx	Number Of Union Employees NumberOfUnionEmployees	18500	employee
CY2018	csx	Numberof Milesof Rightof Way Leased NumberofMilesofRightofWayLeased	137	mi
CY2018	csx	Operating Leases Annual Escalation Percentage OperatingLeasesAnnualEscalationPercentage	0.025
CY2016	csx	Other Nonoperating Income Expense Net OtherNonoperatingIncomeExpenseNet	-93000000	USD
CY2017	csx	Other Nonoperating Income Expense Net OtherNonoperatingIncomeExpenseNet	-32000000	USD
CY2018	csx	Other Nonoperating Income Expense Net OtherNonoperatingIncomeExpenseNet	74000000	USD
CY2018Q4	csx	Percentage Of Assets Depreciated Under Group Life Method PercentageOfAssetsDepreciatedUnderGroupLifeMethod	0.87
CY2018Q4	csx	Percentage Of Labor Cost Rail Installation Deconstruction Of Old Track PercentageOfLaborCostRailInstallationDeconstructionOfOldTrack	0.20
CY2018Q4	csx	Percentage Of Labor Cost Rail Installation Installation Of New Track PercentageOfLaborCostRailInstallationInstallationOfNewTrack	0.80
CY2018Q4	csx	Rail Route Network Distance RailRouteNetworkDistance	20500	mi
CY2016	csx	Real Estate Revenue Gross RealEstateRevenueGross	56000000	USD
CY2017	csx	Real Estate Revenue Gross RealEstateRevenueGross	0	USD
CY2018	csx	Real Estate Revenue Gross RealEstateRevenueGross	0	USD
CY2018	csx	Reclassificationfrom Aoci Stranded Tax Effects ReclassificationfromAOCIStrandedTaxEffects	107000000	USD
CY2016	csx	Restructuring Charges Including Nonoperating Charges RestructuringChargesIncludingNonoperatingCharges	0	USD
CY2017	csx	Restructuring Charges Including Nonoperating Charges RestructuringChargesIncludingNonoperatingCharges	325000000	USD
CY2018	csx	Restructuring Charges Including Nonoperating Charges RestructuringChargesIncludingNonoperatingCharges	0	USD
CY2016	csx	Restructuring Charges Nonoperating RestructuringChargesNonoperating	0	USD
CY2017	csx	Restructuring Charges Nonoperating RestructuringChargesNonoperating	85000000	USD
CY2018	csx	Restructuring Charges Nonoperating RestructuringChargesNonoperating	0	USD
CY2018	csx	Short Term Investments Maximum Maturity Period ShortTermInvestmentsMaximumMaturityPeriod	P1Y
CY2018	csx	Short Term Investments Minimum Maturity Period ShortTermInvestmentsMinimumMaturityPeriod	P3M
CY2018Q4	csx	Total Longterm Debt TotalLongtermDebt	14757000000	USD
CY2018	dei	Amendment Flag AmendmentFlag	false
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	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0000277948
CY2019Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	815630366	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
CY2018Q4	dei	Entity Number Of Employees EntityNumberOfEmployees	22500	employee
CY2018Q2	dei	Entity Public Float EntityPublicFloat	46000000000	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	CSX CORP
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 Current AccountsPayableCurrent	847000000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	949000000	USD
CY2017Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	970000000	USD
CY2018Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	1010000000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	970000000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1010000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	12560000000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	12807000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-486000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-661000000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	217000000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	249000000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	37000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	89000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	51000000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	25000000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	24000000	USD
CY2017Q4	us-gaap	Assets Assets	35739000000	USD
CY2018Q4	us-gaap	Assets Assets	36729000000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	1915000000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	2565000000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	628000000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	603000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	401000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	858000000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-25000000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-202000000	USD
CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	457000000	USD
CY2016	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.72
CY2016	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.72
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.78
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.78
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.88
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.88
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.00
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	890000000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	818000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1739000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5625000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3100000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3134000000	USD
CY2018Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	0	USD
CY2016	us-gaap	Cost Maintenance CostMaintenance	230000000	USD
CY2017	us-gaap	Cost Maintenance CostMaintenance	197000000	USD
CY2018	us-gaap	Cost Maintenance CostMaintenance	145000000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	540000000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	787000000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	572000000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	622000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	904000000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	716000000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	82000000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	117000000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	144000000	USD
CY2017Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	11809000000	USD
CY2018Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	14757000000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	355000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3277000000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	275000000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	405000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3233000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	279000000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	6418000000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	6690000000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	50000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	44000000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	880000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	754000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	657000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	529000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	182000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	146000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	41000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	79000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	7298000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	7444000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	722000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	645000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	6576000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	6799000000	USD
CY2016	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	250000000	USD
CY2017	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0	USD
CY2018	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	0	USD
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2833000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2400000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2431000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Plan Assets DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets	2337000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	2677000000	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	2337000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	2542000000	USD
CY2018	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	-102000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.00
CY2018Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.00
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	35000000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	39000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	41000000	USD
CY2016	us-gaap	Depreciation Depreciation	1301000000	USD
CY2017	us-gaap	Depreciation Depreciation	1315000000	USD
CY2018	us-gaap	Depreciation Depreciation	1331000000	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	680000000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	708000000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	751000000	USD
CY2017Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2018Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2017Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2018Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.81
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.63
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.01
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.05
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.86
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.81
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.62
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.99
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.05
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.84
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.375
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.742
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.231
CY2018Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-1.116
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.000
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.005
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.008
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.005
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.030
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.032
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.026
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	602000000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	550000000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	15000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	42000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	26000000	USD
CY2016	us-gaap	Fuel Costs FuelCosts	713000000	USD
CY2017	us-gaap	Fuel Costs FuelCosts	864000000	USD
CY2018	us-gaap	Fuel Costs FuelCosts	1046000000	USD
CY2016	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	128000000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	18000000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	154000000	USD
CY2016	us-gaap	Gain Loss On Repurchase Of Debt Instrument GainLossOnRepurchaseOfDebtInstrument	-115000000	USD
CY2017	us-gaap	Gain Loss On Repurchase Of Debt Instrument GainLossOnRepurchaseOfDebtInstrument	0	USD
CY2018	us-gaap	Gain Loss On Repurchase Of Debt Instrument GainLossOnRepurchaseOfDebtInstrument	0	USD
CY2016	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	128000000	USD
CY2017	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	18000000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	154000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2741000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3142000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4304000000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	50000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	219000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	96000000	USD
CY2016	us-gaap	Income Loss From Subsidiaries Before Tax IncomeLossFromSubsidiariesBeforeTax	0	USD
CY2017	us-gaap	Income Loss From Subsidiaries Before Tax IncomeLossFromSubsidiariesBeforeTax	0	USD
CY2018	us-gaap	Income Loss From Subsidiaries Before Tax IncomeLossFromSubsidiariesBeforeTax	0	USD
CY2016Q4	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	2000000	USD
CY2017Q4	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	3000000	USD
CY2018Q4	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	-3000000	USD
CY2016Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	6000000	USD
CY2017Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	6000000	USD
CY2018Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	2000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1027000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2329000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	995000000	USD
CY2017Q4	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-3500000000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-3506000000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	959000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1100000000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	904000000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-15000000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-25000000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	102000000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-21000000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	83000000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	112000000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	580000000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	911000000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	814000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	40000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	41000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	104000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-84000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	70000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	46000000	USD
CY2016	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	23000000	USD
CY2017	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	20000000	USD
CY2018	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-104000000	USD
CY2016	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	113000000	USD
CY2017	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-1000000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-101000000	USD
CY2016	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	35000000	USD
CY2017	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	43000000	USD
CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-47000000	USD
CY2016	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-579000000	USD
CY2017	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-546000000	USD
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-639000000	USD
CY2016	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	10000000	USD
CY2017	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	13000000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	32000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	606000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	555000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	614000000	USD
CY2016	us-gaap	Labor And Related Expense LaborAndRelatedExpense	3135000000	USD
CY2017	us-gaap	Labor And Related Expense LaborAndRelatedExpense	2946000000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	2738000000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P50Y
CY2017Q4	us-gaap	Liabilities Liabilities	21018000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	24149000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	35739000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	36729000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1894000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1915000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	11790000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	14739000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	19000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	18000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	12792000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	639000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	192000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	371000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	745000000	USD
CY2015Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	400000000	USD
CY2016Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	374000000	USD
CY2017Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	374000000	USD
CY2018Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	324000000	USD
CY2017Q4	us-gaap	Loss Contingency Accrual Carrying Value Current LossContingencyAccrualCarryingValueCurrent	108000000	USD
CY2018Q4	us-gaap	Loss Contingency Accrual Carrying Value Current LossContingencyAccrualCarryingValueCurrent	113000000	USD
CY2017Q4	us-gaap	Loss Contingency Accrual Carrying Value Noncurrent LossContingencyAccrualCarryingValueNoncurrent	266000000	USD
CY2018Q4	us-gaap	Loss Contingency Accrual Carrying Value Noncurrent LossContingencyAccrualCarryingValueNoncurrent	211000000	USD
CY2016	us-gaap	Loss Contingency Accrual Carrying Value Period Increase Decrease LossContingencyAccrualCarryingValuePeriodIncreaseDecrease	-28000000	USD
CY2018	us-gaap	Loss Contingency Accrual Carrying Value Period Increase Decrease LossContingencyAccrualCarryingValuePeriodIncreaseDecrease	-26000000	USD
CY2016	us-gaap	Loss Contingency Accrual Payments LossContingencyAccrualPayments	126000000	USD
CY2017	us-gaap	Loss Contingency Accrual Payments LossContingencyAccrualPayments	114000000	USD
CY2018	us-gaap	Loss Contingency Accrual Payments LossContingencyAccrualPayments	122000000	USD
CY2016	us-gaap	Loss Contingency Accrual Provision LossContingencyAccrualProvision	128000000	USD
CY2017	us-gaap	Loss Contingency Accrual Provision LossContingencyAccrualProvision	114000000	USD
CY2018	us-gaap	Loss Contingency Accrual Provision LossContingencyAccrualProvision	98000000	USD
CY2017Q4	us-gaap	Materials Supplies And Other MaterialsSuppliesAndOther	372000000	USD
CY2018Q4	us-gaap	Materials Supplies And Other MaterialsSuppliesAndOther	263000000	USD
CY2017Q4	us-gaap	Minority Interest MinorityInterest	16000000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	17000000	USD
CY2016	us-gaap	Multiemployer Plan Contributions By Employer MultiemployerPlanContributionsByEmployer	35000000	USD
CY2017	us-gaap	Multiemployer Plan Contributions By Employer MultiemployerPlanContributionsByEmployer	40000000	USD
CY2018	us-gaap	Multiemployer Plan Contributions By Employer MultiemployerPlanContributionsByEmployer	30000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1268000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2179000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2500000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1798000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1495000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1684000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3041000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3472000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4641000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	1714000000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	362000000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	510000000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	459000000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	4140000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	5471000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	695000000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	877000000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	843000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	3309000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1713000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	5470000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	3308000000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	894000000	USD
CY2016	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	24000000	USD
CY2017	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-32000000	USD
CY2018	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-38000000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	22000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	53000000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	74000000	USD
CY2018Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	23	state
CY2016	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-13000000	USD
CY2017	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	161000000	USD
CY2018	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-119000000	USD
CY2016	us-gaap	Operating Expenses OperatingExpenses	7656000000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	7688000000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	7381000000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	3413000000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	769000000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	957000000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	868000000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	1126000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	3720000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	1044000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	1283000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	1293000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	1249000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	4869000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1577000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	58000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	44000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	50000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	54000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	59000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	1312000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	21000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	3000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	4000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	4000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	4000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	3000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	3000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	25000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	154000000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	161000000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	179000000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	650000000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	594000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-175000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	13000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	65000000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	154000000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	181000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	374000000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	387000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-19000000	USD
CY2016	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2092000000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2113000000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1967000000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	9000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	8000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4000000	USD
CY2016	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-20000000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-17000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-21000000	USD
CY2016	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	-1000000	USD
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	-1000000	USD
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	-1000000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-9000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-37000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	27000000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1056000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1970000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4671000000	USD
CY2016	us-gaap	Payments For Restructuring PaymentsForRestructuring	0	USD
CY2017	us-gaap	Payments For Restructuring PaymentsForRestructuring	187000000	USD
CY2018	us-gaap	Payments For Restructuring PaymentsForRestructuring	15000000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	680000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	708000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	751000000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2398000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2040000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1745000000	USD
CY2016	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	929000000	USD
CY2017	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	782000000	USD
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	736000000	USD
CY2016	us-gaap	Pension Contributions PensionContributions	250000000	USD
CY2017	us-gaap	Pension Contributions PensionContributions	0	USD
CY2018	us-gaap	Pension Contributions PensionContributions	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2200000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	850000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	3000000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-313000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-18000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-59000000	USD
CY2016	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	195000000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	97000000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	319000000	USD
CY2016	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	1325000000	USD
CY2017	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	1193000000	USD
CY2018	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	505000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	44324000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	44805000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	45000000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	31764000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	31998000000	USD
CY2016	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	-51000000	USD
CY2017	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	-58000000	USD
CY2018	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	-32000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1419000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	333000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	19000000	USD
CY2016	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2017	us-gaap	Restructuring Charges RestructuringCharges	240000000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	14084000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	12157000000	USD
CY2016	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11069000000	USD
CY2017Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2869000000	USD
CY2017Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2933000000	USD
CY2017Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2743000000	USD
CY2017Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2863000000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11408000000	USD
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2876000000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3102000000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3129000000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3143000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12250000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12300000000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	139000000	USD
CY2018Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	50000000	USD
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P6Y10M24D
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y8M12D
CY2017Q4	us-gaap	Short Term Investments ShortTermInvestments	18000000	USD
CY2018Q4	us-gaap	Short Term Investments ShortTermInvestments	253000000	USD
CY2016	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	1000000	USD
CY2016	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	38000000	shares
CY2017	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	39000000	shares
CY2018	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	72000000	shares
CY2016	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1056000000	USD
CY2017	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1970000000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	4671000000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	11668000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	11694000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	14721000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	12580000000	USD
CY2016	us-gaap	Stockholders Equity Other StockholdersEquityOther	-22000000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	-80000000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	-147000000	USD
CY2016	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	-10000000	USD
CY2017	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	-21000000	USD
CY2018	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	-62000000	USD
CY2017Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	157000000	USD
CY2018Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	106000000	USD
CY2016	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	27.52
CY2017	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	50.80
CY2018	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	64.64
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	23000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	25000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	24000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	12000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	4000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	11000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	5000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	19000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	9000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	269000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	242000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	275000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	280000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	272000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	4037000000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	2699000000	USD
CY2016	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1000000	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	3000000	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	4000000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	948000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	914000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	861000000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	947000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	911000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	857000000	shares
CY2018	us-gaap	Fiscal Period FiscalPeriod	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Through the second quarter 2017, CSX followed a 52/53 week fiscal reporting calendar with the last day of each reporting period ending on a Friday. On July 7, 2017, the Board of Directors of CSX approved a change in the fiscal reporting calendar from a 52/53 week year ending on the last Friday of December to a calendar year ending on December 31 each year, effective beginning with fiscal third quarter 2017. Related to the change in the fiscal calendar:</font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br clear="none"/></font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" 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:11pt;padding-left:24px;"><font style="font-family:Arial;font-size:11pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Year:</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2018 contained 365 days (January 1, 2018 through December 31, 2018)</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2017 contained 366 days (December 31, 2016 through December 31, 2017) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2016 contained 371 days (December 26, 2015 through December 30, 2016) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" 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:11pt;padding-left:24px;"><font style="font-family:Arial;font-size:11pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">First quarter: </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2018 contained 90 days (January 1, 2018 through March 31, 2018) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2017 contained 91 days (December 31, 2016 through March 31, 2017) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2016 contained 91 days (December 26, 2015 through March 25, 2016) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" 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:11pt;padding-left:24px;"><font style="font-family:Arial;font-size:11pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Second quarter: </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2018 contained 91 days (April 1, 2018 through June 30, 2018) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2017 contained 91 days (April 1, 2017 through June 30, 2017) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2016 contained 91 days (March 26, 2016 through June 24, 2016)</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" 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:11pt;padding-left:24px;"><font style="font-family:Arial;font-size:11pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Third quarter: </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2018 contained 92 days (July 1, 2018 through September 30, 2018)</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2017 contained 92 days (July 1, 2017 through September 30, 2017) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2016 contained 91 days (June 25, 2016 through September 23, 2016) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" 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:11pt;padding-left:24px;"><font style="font-family:Arial;font-size:11pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Fourth quarter: </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2018 contained 92 days (October 1, 2018 through December 31, 2018) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2017 contained 92 days (October 1, 2017 through December 31, 2017) </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" 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:11pt;padding-left:72px;"><font style="font-family:Arial;font-size:11pt;">–</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">2016 contained 98 days (September 24, 2016 through December 30, 2016) </font></div></td></tr></table><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">NOTE 1.  Nature of Operations and Significant Accounting Policies, </font><font style="font-family:Arial;font-size:11pt;font-style:italic;">continued</font></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">This change did not materially impact comparability of the Company’s financial results for fiscal years 2017 and 2016. Accordingly, the change to a calendar fiscal year was made on a prospective basis and operating results for prior periods were not adjusted. The Company was not required to file a transition report because this change was not deemed a change in fiscal year for purposes of reporting subject to Rule 13a-10 or Rule 15d-10 of the Securities Exchange Act of 1934 as the new fiscal year commenced with the end of the prior fiscal year end and within seven days of the prior fiscal year end. Except as otherwise specified, references to full years indicate CSX’s fiscal years ended on December 31, 2018, December 31, 2017 and December 30, 2016.</font></div></div>
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires that management make estimates in reporting the amounts of certain assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of certain revenues and expenses during the reporting period. Actual results may differ from those estimates. Critical accounting estimates using management judgment are made for the following areas:</font></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br clear="none"/></font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:72px;" 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:11pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">personal injury, environmental and legal reserves (see Note 5, </font><font style="font-family:Arial;font-size:11pt;font-style:italic;">Casualty, Environmental and Other Reserves</font><font style="font-family:Arial;font-size:11pt;">);</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:72px;" 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:11pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">pension and post-retirement medical plan accounting (see Note 8, </font><font style="font-family:Arial;font-size:11pt;font-style:italic;">Employee Benefit Plans</font><font style="font-family:Arial;font-size:11pt;">);</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:72px;" 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:11pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">depreciation policies for assets under the group-life method (see Note 6, </font><font style="font-family:Arial;font-size:11pt;font-style:italic;">Properties</font><font style="font-family:Arial;font-size:11pt;">); and</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:72px;" 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:11pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">income taxes (see Note 11, </font><font style="font-family:Arial;font-size:11pt;font-style:italic;">Income Taxes</font><font style="font-family:Arial;font-size:11pt;">).</font></div></td></tr></table></div>

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$CSX
CSX CORP Stock $csx

2018 Form 10-K Financial Statement

#000027794819000011 Filed on February 06, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSX CSX CORP Stock $csx

2018 Form 10-K Financial Statement

#000027794819000011 Filed on February 06, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSX
CSX CORP Stock $csx