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Label Element Value
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 $ 7,068,000,000
Accounts Receivable, Allowance for Credit Loss us-gaap_AllowanceForDoubtfulAccountsReceivable $ 43,000,000
Common Stock, Shares, Outstanding us-gaap_CommonStockSharesOutstanding 137,000,000.0
Cargo and Freight [Member]  
Accounts Receivable, Allowance for Credit Loss us-gaap_AllowanceForDoubtfulAccountsReceivable $ 27,000,000
Non-Freight [Member]  
Accounts Receivable, Allowance for Credit Loss us-gaap_AllowanceForDoubtfulAccountsReceivable 16,000,000
AOCI Attributable to Parent [Member]  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 (2,522,000,000)
Additional Paid-in Capital [Member]  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 48,000,000
Common Stock [Member]  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 1,993,000,000
Retained Earnings [Member]  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 7,549,000,000
Accounting Standards Update 2016-13 [Member] | AOCI Attributable to Parent [Member]  
Cumulative Effect of New Accounting Principle in Period of Adoption us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption 0
Accounting Standards Update 2016-13 [Member] | Additional Paid-in Capital [Member]  
Cumulative Effect of New Accounting Principle in Period of Adoption us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption 0
Accounting Standards Update 2016-13 [Member] | Common Stock [Member]  
Cumulative Effect of New Accounting Principle in Period of Adoption us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption 0
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member]  
Cumulative Effect of New Accounting Principle in Period of Adoption us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption $ (1,000,000)