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Investment Securities - Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 96,615 $ 92,793
Unrealized Gains 149 58
Unrealized Losses (6,187) (6,859)
Fair Value [1] 90,577 85,992
Portfolio level basis adjustments, Amortized Cost 314 13
Portfolio level basis adjustments, Unrealized Losses (314) (13)
U.S. Treasury and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 29,790 30,467
Unrealized Gains 9 1
Unrealized Losses (1,682) (2,081)
Fair Value 28,117 28,387
Residential mortgage-backed securities | Agency    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 39,763 35,558
Unrealized Gains 110 13
Unrealized Losses (1,740) (2,290)
Fair Value 38,133 33,281
Commercial mortgage-backed securities | Agency    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 8,633 8,673
Unrealized Gains 0 0
Unrealized Losses (1,018) (1,322)
Fair Value 7,615 7,351
Commercial mortgage-backed securities | Non-agency    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 7 7
Unrealized Gains 0 0
Unrealized Losses 0 (1)
Fair Value 7 6
Asset-backed securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 7,167 7,136
Unrealized Gains 18 30
Unrealized Losses (2) (1)
Fair Value 7,183 7,165
Obligations of state and political subdivisions    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 10,631 10,690
Unrealized Gains 9 13
Unrealized Losses (1,431) (1,151)
Fair Value 9,209 9,552
Other    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 310 249
Unrealized Gains 3 1
Unrealized Losses 0 0
Fair Value 313 250
Excluding portfolio level basis adjustments    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 96,301 92,780
Unrealized Gains 149 58
Unrealized Losses (5,873) (6,846)
Fair Value $ 90,577 $ 85,992
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.