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Investment Securities - Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 87,398 $ 76,602
Unrealized Gains 158 173
Unrealized Losses (5,852) (7,069)
Fair Value [1] 81,704 69,706
Portfolio level basis adjustments, Amortized Cost 525 335
Portfolio level basis adjustments, Unrealized Losses (525) (335)
U.S. Treasury and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 31,201 21,768
Unrealized Gains 1 8
Unrealized Losses (1,803) (2,234)
Fair Value 29,399 19,542
Residential mortgage-backed securities | Agency    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 29,247 28,185
Unrealized Gains 94 104
Unrealized Losses (1,575) (2,211)
Fair Value 27,766 26,078
Commercial mortgage-backed securities | Agency    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 8,681 8,703
Unrealized Gains 0 0
Unrealized Losses (1,076) (1,360)
Fair Value 7,605 7,343
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 6,757 6,713
Unrealized Gains 31 25
Unrealized Losses 0 (14)
Fair Value 6,788 6,724
Obligations of state and political subdivisions    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 10,732 10,867
Unrealized Gains 29 36
Unrealized Losses (873) (914)
Fair Value 9,888 9,989
Other    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 248 24
Unrealized Gains 3 0
Unrealized Losses 0 0
Fair Value 251 24
Excluding portfolio level basis adjustments    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 86,873 76,267
Unrealized Gains 158 173
Unrealized Losses (5,327) (6,734)
Fair Value $ 81,704 $ 69,706
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.