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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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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.

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