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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee Termination Benefits      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1 $ 62 $ 111 $ 308
Additions (reductions) charged to expense 5 20 160
Payments/ reductions (48) (69) (357)
Balance at December 31 19 62 111
Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1 606 487 429
Additions (reductions) charged to expense 379 128 76
Payments/ reductions (5) (9) (18)
Balance at December 31 980 606 487
Deferred Income Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1 16,574 16,069 15,412
Additions (reductions) charged to expense 2,000 2,681 1,810
Payments/ reductions (2,601) (2,176) (1,153)
Balance at December 31 $ 15,973 $ 16,574 $ 16,069