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
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Available for sale securities    
Amortized Cost $ 64,950 $ 66,225
Gross Unrealized Gains 0 3
Gross Unrealized Losses 3,860 3,871
Fair Value 61,090 62,357
Unallocated portfolio layer method (PLM) fair value basis adjustments, Amortized Cost (2) 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 (2) 2
Held to maturity securities    
Amortized Cost 131,671 133,969
Gross Unrealized Gains 1,291 1,732
Gross Unrealized Losses 9,911 9,646
Fair Value 123,051 126,055
U.S. agency mortgage-backed securities    
Available for sale securities    
Amortized Cost 42,843 44,585
Gross Unrealized Gains 0 0
Gross Unrealized Losses 3,152 3,151
Fair Value 39,691 41,434
Held to maturity securities    
Amortized Cost 131,155 133,563
Gross Unrealized Gains 1,291 1,732
Gross Unrealized Losses 9,907 9,646
Fair Value 122,539 125,649
U.S. Treasury securities    
Available for sale securities    
Amortized Cost 11,512 11,543
Gross Unrealized Gains 0 3
Gross Unrealized Losses 176 182
Fair Value 11,336 11,364
Held to maturity securities    
Amortized Cost 516 406
Gross Unrealized Gains 0 0
Gross Unrealized Losses 4 0
Fair Value 512 406
U.S. Treasury securities | Cash and Cash Equivalents    
Available for sale securities    
Amortized Cost   2,000
Corporate debt securities    
Available for sale securities    
Amortized Cost 5,142 5,027
Gross Unrealized Gains 0 0
Gross Unrealized Losses 357 360
Fair Value 4,785 4,667
Asset-backed securities    
Available for sale securities    
Amortized Cost 4,723 4,332
Gross Unrealized Gains 0 0
Gross Unrealized Losses 134 133
Fair Value 4,589 4,199
U.S. state and municipal securities    
Available for sale securities    
Amortized Cost 591 595
Gross Unrealized Gains 0 0
Gross Unrealized Losses 33 34
Fair Value 558 561
Non-agency commercial mortgage-backed securities    
Available for sale securities    
Amortized Cost 120 120
Gross Unrealized Gains 0 0
Gross Unrealized Losses 7 7
Fair Value 113 113
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) 26.00% 27.00%
Corporate Debt Securities Issued By Institutions In Healthcare Industry | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 21.00% 19.00%
Federal Family Education Loan Program (FFELP) Guaranteed Loans | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 62.00% 70.00%
Collateralized Credit Card Securities | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration (percent) 21.00% 21.00%
Commercial paper | Cash and Cash Equivalents    
Available for sale securities    
Amortized Cost $ 291