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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Termination Benefits      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1 $ 7 $ 19 $ 62
Additions (reductions) charged to expense 859 6 5
Payments/ reductions (396) (18) (48)
Balance at December 31 470 7 19
Expected Credit Losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1 849 980 606
Current period provision 573 (128) 379
Additions (reductions) charged to expense (751) (3) (5)
Payments/ reductions 0 0 0
Balance at December 31 671 849 980
Deferred Income Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1 15,965 15,973 16,574
Additions (reductions) charged to expense 2,892 1,336 2,000
Payments/ reductions (1,095) (1,344) (2,601)
Balance at December 31 17,762 $ 15,965 $ 15,973
Deferred Income Tax Valuation Allowance | Noble      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additions (reductions) charged to expense $ 974