v3.26.1
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
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Available for sale securities    
Amortized Cost $ 66,312 $ 66,225
Gross Unrealized Gains 1 3
Gross Unrealized Losses 3,846 3,871
Fair Value 62,467 62,357
Unallocated portfolio layer method (PLM) fair value basis adjustments, Amortized Cost (4) 2
Unallocated portfolio layer method fair value basis adjustments, gross unrealized gains 0 0
Unallocated portfolio layer method fair value basis adjustments, gross unrealized losses (4) 2
Held to maturity securities    
Amortized Cost 130,568 133,969
Gross Unrealized Gains 631 1,732
Gross Unrealized Losses 9,993 9,646
Fair Value 121,206 126,055
Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Available for sale securities    
Amortized Cost 0  
U.S. agency mortgage-backed securities    
Available for sale securities    
Amortized Cost 40,938 44,585
Gross Unrealized Gains 0 0
Gross Unrealized Losses 3,197 3,151
Fair Value 37,741 41,434
Held to maturity securities    
Amortized Cost 128,551 133,563
Gross Unrealized Gains 631 1,732
Gross Unrealized Losses 9,962 9,646
Fair Value 119,220 125,649
U.S. Treasury securities    
Available for sale securities    
Amortized Cost 12,097 11,543
Gross Unrealized Gains 0 3
Gross Unrealized Losses 146 182
Fair Value 11,951 11,364
Held to maturity securities    
Amortized Cost 2,017 406
Gross Unrealized Gains 0 0
Gross Unrealized Losses 31 0
Fair Value 1,986 406
U.S. Treasury securities | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Available for sale securities    
Amortized Cost   2,000
Corporate debt securities    
Available for sale securities    
Amortized Cost 5,346 5,027
Gross Unrealized Gains 0 0
Gross Unrealized Losses 329 360
Fair Value 5,017 4,667
Asset-backed securities    
Available for sale securities    
Amortized Cost 7,335 4,332
Gross Unrealized Gains 1 0
Gross Unrealized Losses 132 133
Fair Value 7,204 4,199
U.S. state and municipal securities    
Available for sale securities    
Amortized Cost 459 595
Gross Unrealized Gains 0 0
Gross Unrealized Losses 35 34
Fair Value 424 561
Non-agency commercial mortgage-backed securities    
Available for sale securities    
Amortized Cost 120 120
Gross Unrealized Gains 0 0
Gross Unrealized Losses 8 7
Fair Value 112 113
Other    
Available for sale securities    
Amortized Cost 21 21
Gross Unrealized Gains 0 0
Gross Unrealized Losses 3 2
Fair Value $ 18 $ 19
Corporate Debt Securities Issued By Information Technology Industry | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 28.00% 28.00%
Corporate Debt Securities Issued By Consumer Staples Industry | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 25.00% 27.00%
Corporate Debt Securities Issued By Institutions In Healthcare Industry | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 20.00% 19.00%
Federal Family Education Loan Program (FFELP) Guaranteed Loans | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 38.00% 70.00%
Collateralized Credit Card Securities | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 33.00% 21.00%