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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee Termination Benefits      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1 $ 470 $ 7 $ 19
Additions (reductions) charged to expense (30) 859 6
Payments/ reductions (397) (396) (18)
Balance at December 31 43 470 7
Expected Credit Losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1 671 849 980
Current period provision 74 573 (128)
Additions (reductions) charged to expense 0 (751) (3)
Balance at December 31 745 671 849
Deferred Income Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1 17,762 15,965 15,973
Additions (reductions) charged to expense 3,691 2,892 1,336
Payments/ reductions (3,802) (1,095) (1,344)
Balance at December 31 17,651 $ 17,762 $ 15,965
Deferred Income Tax Valuation Allowance | Noble      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additions (reductions) charged to expense $ 974