v3.26.1
Fair Value - Schedule of Financial Assets and Liabilities Carried at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets $ 856 $ 827
Available-for-sale investment securities: 72,297 67,154
Derivative asset, Impact of Netting (15,309) (10,104)
Total derivative instruments 8,806 4,155
Other 1,029 854
Other, Impact of Netting 0 0
Total 82,988 72,990
Derivative liability, Impact of Netting (19,543) (9,236)
Derivative liabilities 4,819 5,025
Total liabilities carried at fair value 4,819 5,025
Cash collateral provided 2,707 2,481
Cash collateral received 6,941 1,614
U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 56 55
Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 116 124
Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 684 648
Available-for-sale investment securities:   0
Direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 24,457 23,260
Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 16,957 15,586
Total U.S. Treasury and federal agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 41,414 38,846
Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,691 2,578
Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,594 2,085
Non-U.S. sovereign, supranational and non-U.S. agency    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 19,639 17,731
Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,762 2,826
Total non-U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 27,686 25,220
Student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 36 64
Collateralized loan obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 3,045 2,905
Non-agency CMBS and RMBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 3
Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 91 91
Total asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 3,172 3,063
State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 25 25
Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, Impact of Netting (15,298) (10,073)
Total derivative instruments 8,806 4,151
Derivative liability, Impact of Netting (19,529) (9,231)
Derivative liabilities 4,699 4,866
Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, Impact of Netting (11) (31)
Total derivative instruments 0 3
Derivative liability, Impact of Netting (14) (5)
Derivative liabilities 2 0
Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, Impact of Netting   0
Total derivative instruments   1
Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability, Impact of Netting 0 0
Derivative liabilities 118 159
Quoted Market Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 56 55
Available-for-sale investment securities: 24,457 23,260
Derivative asset 81 9
Other 18 22
Total 24,612 23,346
Derivative liability 4 0
Total liabilities carried at fair value 4 0
Quoted Market Prices in Active Markets (Level 1) | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 56 55
Quoted Market Prices in Active Markets (Level 1) | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Quoted Market Prices in Active Markets (Level 1) | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Available-for-sale investment securities:   0
Quoted Market Prices in Active Markets (Level 1) | Direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 24,457 23,260
Quoted Market Prices in Active Markets (Level 1) | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Total U.S. Treasury and federal agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 24,457 23,260
Quoted Market Prices in Active Markets (Level 1) | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Non-U.S. sovereign, supranational and non-U.S. agency    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Total non-U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Collateralized loan obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Non-agency CMBS and RMBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities:   0
Quoted Market Prices in Active Markets (Level 1) | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Total asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Quoted Market Prices in Active Markets (Level 1) | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 81 5
Derivative liability 0 0
Quoted Market Prices in Active Markets (Level 1) | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 3
Derivative liability 2 0
Quoted Market Prices in Active Markets (Level 1) | Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset   1
Quoted Market Prices in Active Markets (Level 1) | Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 2 0
Pricing Methods with Significant Observable Market Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 800 772
Available-for-sale investment securities: 47,840 43,894
Derivative asset 24,025 14,249
Other 1,011 832
Total 73,676 59,747
Derivative liability 24,351 14,261
Total liabilities carried at fair value 24,351 14,261
Pricing Methods with Significant Observable Market Inputs (Level 2) | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Pricing Methods with Significant Observable Market Inputs (Level 2) | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 116 124
Pricing Methods with Significant Observable Market Inputs (Level 2) | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 684 648
Available-for-sale investment securities:   0
Pricing Methods with Significant Observable Market Inputs (Level 2) | Direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Observable Market Inputs (Level 2) | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 16,957 15,586
Pricing Methods with Significant Observable Market Inputs (Level 2) | Total U.S. Treasury and federal agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 16,957 15,586
Pricing Methods with Significant Observable Market Inputs (Level 2) | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,691 2,578
Pricing Methods with Significant Observable Market Inputs (Level 2) | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,594 2,085
Pricing Methods with Significant Observable Market Inputs (Level 2) | Non-U.S. sovereign, supranational and non-U.S. agency    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 19,639 17,731
Pricing Methods with Significant Observable Market Inputs (Level 2) | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,762 2,826
Pricing Methods with Significant Observable Market Inputs (Level 2) | Total non-U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 27,686 25,220
Pricing Methods with Significant Observable Market Inputs (Level 2) | Student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 36 64
Pricing Methods with Significant Observable Market Inputs (Level 2) | Collateralized loan obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 3,045 2,905
Pricing Methods with Significant Observable Market Inputs (Level 2) | Non-agency CMBS and RMBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities:   3
Pricing Methods with Significant Observable Market Inputs (Level 2) | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 91 91
Pricing Methods with Significant Observable Market Inputs (Level 2) | Total asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 3,172 3,063
Pricing Methods with Significant Observable Market Inputs (Level 2) | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 25 25
Pricing Methods with Significant Observable Market Inputs (Level 2) | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 24,014 14,218
Derivative liability 24,221 14,097
Pricing Methods with Significant Observable Market Inputs (Level 2) | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 11 31
Derivative liability 14 5
Pricing Methods with Significant Observable Market Inputs (Level 2) | Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset   0
Pricing Methods with Significant Observable Market Inputs (Level 2) | Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 116 159
Pricing Methods with Significant Unobservable Market Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Available-for-sale investment securities: 0 0
Derivative asset 9 1
Other 0 0
Total 9 1
Derivative liability 7 0
Total liabilities carried at fair value 7 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Available-for-sale investment securities:   0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Total U.S. Treasury and federal agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Non-U.S. sovereign, supranational and non-U.S. agency    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Total non-U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Collateralized loan obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Non-agency CMBS and RMBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities:   0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Total asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 9 1
Derivative liability 7 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset   0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability $ 0 $ 0