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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued Liabilities, Current [Abstract] |  |  |
Deferred Payroll Support Program grant proceeds |  | $ 957 | $ 0
Voluntary Separation 2020 |  | 307 | 0
Profitsharing and savings plans |  | 26 | 695
Vacation pay |  | 454 | 434
Health |  | 104 | 120
Workers compensation |  | 159 | 166
Property and income taxes |  | 72 | 79
Other |  | 233 | 250
Accrued liabilities |  | 2,372 | 1,749
Interest rate derivatives | Accrued Liabilities [Member] |  |  |
Accrued Liabilities, Current [Abstract] |  |  |
Derivative contracts | [1] | $ 60 | $ 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.

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