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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Extended Emergency Time Off | $ 0 | $ 57
Voluntary Separation Program | 254 | 321
Postretirement obligation | 436 | 428
Other deferred compensation | 341 | 353
Other | 67 | 88
Other noncurrent liabilities | 1,098 | 1,247
Unusual or Infrequent Item, or Both [Line Items] |  |
Taxes receivable | 710 | 740
Vendor prepayment | 0 | 600
CARES Act |  |
Unusual or Infrequent Item, or Both [Line Items] |  |
Taxes receivable | $ 472 | $ 470

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