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Investment Securities - Gross Unrealized Losses Ratio to Fair Value (Details)
$ in Millions
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Available-for-sale investment securities with gross unrealized losses    
Number of Securities, Less than 12 months | security 0 0
Number of Securities, 12 months or more | security 45 71
Number of Securities, Total | security 45 71
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months $ 0 $ 0
Estimated Fair Value, 12 months or more 152 1,154
Estimated Fair Value, Total 152 1,154
Available-for-sale investment securities with gross unrealized losses    
Gross Unrealized Losses, Less than 12 months 0 0
Gross Unrealized Losses, 12 months or more (12) (19)
Gross Unrealized Losses, Total $ (12) $ (19)
90%–100%    
Available-for-sale investment securities with gross unrealized losses    
Number of Securities, Less than 12 months | security 0 0
Number of Securities, 12 months or more | security 30 69
Number of Securities, Total | security 30 69
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months $ 0 $ 0
Estimated Fair Value, 12 months or more 129 1,140
Estimated Fair Value, Total 129 1,140
Available-for-sale investment securities with gross unrealized losses    
Gross Unrealized Losses, Less than 12 months 0 0
Gross Unrealized Losses, 12 months or more (3) (14)
Gross Unrealized Losses, Total $ (3) $ (14)
Less than 90%    
Available-for-sale investment securities with gross unrealized losses    
Number of Securities, Less than 12 months | security 0 0
Number of Securities, 12 months or more | security 15 2
Number of Securities, Total | security 15 2
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months $ 0 $ 0
Estimated Fair Value, 12 months or more 23 14
Estimated Fair Value, Total 23 14
Available-for-sale investment securities with gross unrealized losses    
Gross Unrealized Losses, Less than 12 months 0 0
Gross Unrealized Losses, 12 months or more (9) (5)
Gross Unrealized Losses, Total $ (9) $ (5)