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Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income Tax Expense (Benefit) $ 2 $ 11 $ (37) $ (2)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive loss at beginning of period     3,298  
Accumulated other comprehensive loss at end of period $ 3,606   $ 3,606