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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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