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Debt Securities - Continuous Unrealized Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Estimated fair value    
Less than 12 months $ 2,205 $ 3,590
12 months or more 1,797 1,092
Gross unrealized losses    
Less than 12 months (5) (62)
12 months or more (80) (60)
U.S. government and federal agency    
Estimated fair value    
Less than 12 months 1,777 3,032
12 months or more 1,183 638
Gross unrealized losses    
Less than 12 months (2) (30)
12 months or more (19) (23)
State and municipal    
Estimated fair value    
Less than 12 months 1 5
12 months or more 9 5
Gross unrealized losses    
Less than 12 months 0 0
12 months or more 0 0
Residential mortgage-backed    
Estimated fair value    
Less than 12 months 27 316
12 months or more 349 101
Gross unrealized losses    
Less than 12 months (2) (31)
12 months or more (46) (18)
Asset-backed    
Estimated fair value    
Less than 12 months 400 230
12 months or more 248 348
Gross unrealized losses    
Less than 12 months (1) 0
12 months or more (15) (19)
Other Debt Obligations    
Estimated fair value    
Less than 12 months 0 7
12 months or more 8 0
Gross unrealized losses    
Less than 12 months 0 (1)
12 months or more $ 0 $ 0