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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
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 174 $ 127 $ 64
Additions charges to expenses 154 69 80
Deductions from reserves [1] (120) (22) (17)
Balance at end of period   174 127
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 457 669 559
Additions charges to expenses 56 20 451
Deductions from reserves [2] (60) (232) (341)
Balance at end of period $ 453 $ 457 $ 669
[1] Deductions include write-offs, recoveries collected and currency translation adjustments.
[2] Deductions include currency translation adjustments.