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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Available for sale securities    
Amortized Cost $ 66,698 $ 89,704
Gross Unrealized Gains 3 1
Gross Unrealized Losses 4,393 6,711
Fair Value 62,308 82,994
Unallocated portfolio layer method (PLM) fair value basis adjustments, Amortized Cost 8 (47)
Unallocated portfolio layer method fair value basis adjustments, Gross Unrealized Gains 0 0
Unallocated portfolio layer method fair value basis adjustments, Gross Unrealized Losses 8 (47)
Held to maturity securities    
Amortized Cost 136,693 146,453
Gross Unrealized Gains 1,672 146
Gross Unrealized Losses 10,106 13,994
Fair Value 128,259 132,605
U.S. agency mortgage-backed securities    
Available for sale securities    
Amortized Cost 48,011 57,262
Gross Unrealized Gains 0 0
Gross Unrealized Losses 3,555 5,429
Fair Value 44,456 51,833
Held to maturity securities    
Amortized Cost 136,693 146,453
Gross Unrealized Gains 1,672 146
Gross Unrealized Losses 10,106 13,994
Fair Value 128,259 132,605
U.S. Treasury securities    
Available for sale securities    
Amortized Cost 8,009 14,939
Gross Unrealized Gains 3 1
Gross Unrealized Losses 226 471
Fair Value 7,786 14,469
Corporate debt securities    
Available for sale securities    
Amortized Cost 5,502 10,166
Gross Unrealized Gains 0 0
Gross Unrealized Losses 411 587
Fair Value 5,091 9,579
Asset-backed securities    
Available for sale securities    
Amortized Cost 4,429 6,106
Gross Unrealized Gains 0 0
Gross Unrealized Losses 148 196
Fair Value 4,281 5,910
U.S. state and municipal securities    
Available for sale securities    
Amortized Cost 597 603
Gross Unrealized Gains 0 0
Gross Unrealized Losses 35 54
Fair Value 562 549
Foreign government agency securities    
Available for sale securities    
Amortized Cost   533
Gross Unrealized Gains   0
Gross Unrealized Losses   6
Fair Value   527
Non-agency commercial mortgage-backed securities    
Available for sale securities    
Amortized Cost 121 121
Gross Unrealized Gains 0 0
Gross Unrealized Losses 8 12
Fair Value 113 109
Other    
Available for sale securities    
Amortized Cost 21 21
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2 3
Fair Value $ 19 $ 18
Corporate Debt Securities Issued By Financial Services Industry | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 15.00% 35.00%
Corporate Debt Securities Issued By Information Technology Industry | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 25.00% 16.00%
Corporate Debt Securities Issued By Consumer Staples Industry | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 24.00% 18.00%
Federal Family Education Loan Program (FFELP) Guaranteed Loans | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 71.00% 62.00%
Collateralized Credit Card Securities | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 21.00% 25.00%