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Investment Securities - Gross Unrealized Losses Ratio to Fair Value (Details)
$ in Millions
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Available-for-sale investment securities with gross unrealized losses    
Number of Securities, Less than 12 months | security 0 88
Number of Securities, 12 months or more | security 71 3
Number of Securities, Total | security 71 91
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months $ 0 $ 4,311
Estimated Fair Value, 12 months or more 1,154 52
Estimated Fair Value, Total 1,154 4,363
Available-for-sale investment securities with gross unrealized losses    
Gross Unrealized Losses, Less than 12 months 0 (83)
Gross Unrealized Losses, 12 months or more (19) (1)
Gross Unrealized Losses, Total $ (19) $ (84)
90%–100%    
Available-for-sale investment securities with gross unrealized losses    
Number of Securities, Less than 12 months | security 0 74
Number of Securities, 12 months or more | security 69 3
Number of Securities, Total | security 69 77
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months $ 0 $ 4,287
Estimated Fair Value, 12 months or more 1,140 52
Estimated Fair Value, Total 1,140 4,339
Available-for-sale investment securities with gross unrealized losses    
Gross Unrealized Losses, Less than 12 months 0 (74)
Gross Unrealized Losses, 12 months or more (14) (1)
Gross Unrealized Losses, Total $ (14) $ (75)
Less than 90%    
Available-for-sale investment securities with gross unrealized losses    
Number of Securities, Less than 12 months | security 0 14
Number of Securities, 12 months or more | security 2 0
Number of Securities, Total | security 2 14
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months $ 0 $ 24
Estimated Fair Value, 12 months or more 14 0
Estimated Fair Value, Total 14 24
Available-for-sale investment securities with gross unrealized losses    
Gross Unrealized Losses, Less than 12 months 0 (9)
Gross Unrealized Losses, 12 months or more (5) 0
Gross Unrealized Losses, Total $ (5) $ (9)