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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Contingency [Line Items]      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued $ 1 $ 2  
Unrecognized Tax Benefits, Period Increase (Decrease) $ 0 $ (2) $ 3
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 439 $ 448 $ 446
Effective Income Tax Rate Reconciliation, Percent 44.00% 35.00% 35.00%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 465 $ 463  
Additions for current year tax positions 0 6 $ 2
Additions for tax positions of prior years 3 4 146
Reductions for tax positions of prior years (6) (5) (26)
Lapse of statute of limitations (4) (3) (7)
Ending balance 458 465 463
Unrecognized Tax Benefits, Income Tax Penalties Accrued 0 0  
Unrecognized Tax Benefits, Income Tax Penalties Expense $ 0 $ 0 $ 0
UNITED STATES      
Income Tax Contingency [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 161    
Effective Income Tax Rate Reconciliation, Percent 35.00%