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Schedule II - Valuation and Qualifying Accounts (Details) - Deferred tax asset valuation allowance - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 888 | $ 1,145 | $ 101
Charged to Costs and Expenses | 13 | 6 | 8
Charged to Other Accounts | (127) | 64 | 1,036
Deductions | (77) | (327) | 0
Balance at End of Period | $ 697 | $ 888 | $ 1,145

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