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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
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 111 $ 113 $ 116
Additions, charged (credited) to income 30 13 21
Additions, charged (credited) to AOCL 0 0 0
Deductions from reserves (11) (14) (19)
Translation adjustment during period 5 (1) (5)
Balance at end of period 150 111 113
Allowance for doubtful accounts | Accounting Standards Update 2016-13 | Revision of Prior Period, Accounting Standards Update, Adjustment      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 126    
Balance at end of period   126  
Valuation allowance — deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 982 317 318
Additions, charged (credited) to income 488 661 18
Additions, charged (credited) to AOCL (1) 4 (1)
Deductions from reserves 0 0 0
Translation adjustment during period 0 0 (18)
Balance at end of period $ 1,469 $ 982 $ 317