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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 3,598 $ 3,714 $ 3,849 $ 3,951
Reclassification into earnings, tax 0 0 0 0
Change in fair value, tax 0 0 0 0
Ending balance 3,446 3,813 3,446 3,813
Available-for-sale securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1) 0 0 0
Reclassifications into earnings, net of taxes 0 0 0 0
Change in fair value (1) 0 (2) 0
Ending balance $ (2) $ 0 $ (2) $ 0