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Supplementary Information Supplementary Information (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accrued and other current liabilities $ 4,807 $ 4,434
Accounts Payable 3,615 3,702
Accounts Payable, Trade, Current 2,557 2,577
Accounts Payable, Other $ 1,058 $ 927