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Income Tax (Provision for Income Tax Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ (20) $ 45
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount 4 1
Income Tax Reconciliation Foreign Income Tax Basis Differential 3 (15)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount (4) 19
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount 6 1
Income Tax Reconciliation Change In Foreign Enacted Tax Rate 0 (2)
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount (1) (2)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 4 0
Income Tax Expense (Benefit) $ (8) $ 47
Effective Income Tax Rate Reconciliation, Percent 8.90% 21.70%