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Schedule II - Valuation and Qualifying Accounts (Details) - Deferred tax asset valuation allowance - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 1,145 $ 101 $ 103
Charged to Costs and Expenses 6 8 1
Charged to Other Accounts 64 1,036 (3)
Deductions (327) 0 0
Balance at End of Period $ 888 $ 1,145 $ 101