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Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income Tax Expense (Benefit) $ (19) $ (7)
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 $ 3,608