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Summary of Basis of Presentation and Recent Accounting Standards - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period $ 12,817 $ 13,854 $ 18,863 $ 13,854 $ 19,123
Other comprehensive income 30 22 4 52 107
Balance at end of period 11,712 12,817 16,949 11,712 16,949
Total          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period (101) (123) (267) (123) (370)
Other comprehensive income 30   4 52 107
Balance at end of period (71) (101) $ (263) (71) $ (263)
Unrealized Gains on Available-for-Sale Debt Securities          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period (92) (114)   (114)  
Other comprehensive income 30 22      
Balance at end of period (62) (92)   (62)  
Pension and Postretirement Benefits          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period (9) (9)   (9)  
Other comprehensive income 0 0      
Balance at end of period $ (9) $ (9)   $ (9)