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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

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