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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Accrued Liabilities, Current [Abstract]    
Extended Emergency Time Off $ 457 $ 0
Voluntary Separation Program 2020 242 0
Profitsharing and savings plans 21 695
Vacation pay 418 434
Health 110 120
Workers compensation 158 166
Property and income taxes 75 79
Other 327 250
Accrued liabilities 1,836 1,749
Interest rate derivatives | Accrued Liabilities [Member]    
Accrued Liabilities, Current [Abstract]    
Derivative contracts [1] $ 28 $ 5
[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 10.