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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accrued Liabilities, Current [Abstract] |  |
Deferred Payroll Support Program grant proceeds | $ 763 | $ 0
Extended Emergency Time Off | 48 | 393
Voluntary Separation Program | 112 | 143
Profitsharing and savings plans | 136 | 25
Vendor prepayment | 0 | 600
Vacation pay | 448 | 436
Health | 109 | 111
Workers compensation | 145 | 161
Property and income taxes | 102 | 84
Interest | 47 | 49
Deferred supplier payments | 151 | 0
Other | 292 | 257
Accrued liabilities | $ 2,353 | $ 2,259

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