v3.25.2
Fair Value - Schedule of Financial Assets and Liabilities Carried at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets $ 791 $ 768
Available-for-sale investment securities: 70,603 58,895
Bank-owned life insurance 9,475 11,183
Derivative asset, collateral, cash offset 3,071 1,860
Derivative liability, collateral, cash offset 1,999 6,103
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 791 768
Available-for-sale investment securities: 70,603 58,895
Derivative asset, Impact of Netting (16,724) (18,285)
Bank-owned life insurance 9,475 11,183
Other 777 767
Other, Impact of Netting 0 0
Total 81,646 71,613
Derivative liability, Impact of Netting (15,653) (22,528)
Derivative liabilities 10,787 6,596
Total liabilities carried at fair value 10,787 6,596
Recurring | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, Impact of Netting (16,679) (18,262)
Bank-owned life insurance 9,475 11,177
Derivative liability, Impact of Netting (15,650) (22,527)
Derivative liabilities 10,589 6,377
Recurring | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, Impact of Netting (45) (23)
Bank-owned life insurance 0 5
Derivative liability, Impact of Netting (3) (1)
Derivative liabilities 4 0
Recurring | Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, Impact of Netting   0
Bank-owned life insurance   1
Recurring | 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 194 219
Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 35 34
Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 133 121
Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 623 613
Available-for-sale investment securities: 26 52
Recurring | Direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 26,811 23,525
Recurring | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 14,867 10,566
Recurring | 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: 41,678 34,091
Recurring | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 3,009 2,430
Recurring | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,462 1,868
Recurring | 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: 16,508 13,939
Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 3,271 2,821
Recurring | Total non-U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 25,250 21,058
Recurring | Student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 84 90
Recurring | Collateralized loan obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 3,440 3,453
Recurring | Non-agency CMBS and RMBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 4 4
Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 91 91
Recurring | Total asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 3,619 3,638
Recurring | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 30 56
Recurring | Quoted Market Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 35 34
Available-for-sale investment securities: 26,811 23,525
Derivative asset 1 22
Other 23 20
Total 26,870 23,601
Derivative liability 8 0
Total liabilities carried at fair value 8 0
Recurring | 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 1 16
Derivative liability 3 0
Recurring | 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 5
Derivative liability 4 0
Recurring | 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
Recurring | 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 1 0
Recurring | 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 35 34
Recurring | 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
Recurring | 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 0
Recurring | 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: 26,811 23,525
Recurring | 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
Recurring | 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: 26,811 23,525
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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 0
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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 756 734
Available-for-sale investment securities: 43,792 35,370
Derivative asset 26,195 29,445
Other 754 747
Total 71,497 66,296
Derivative liability 26,431 29,124
Total liabilities carried at fair value 26,431 29,124
Recurring | 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 26,150 29,422
Derivative liability 26,235 28,904
Recurring | 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 45 23
Derivative liability 3 1
Recurring | 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
Recurring | 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 193 219
Recurring | 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
Recurring | 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 133 121
Recurring | 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 623 613
Available-for-sale investment securities: 26 52
Recurring | 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
Recurring | 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: 14,867 10,566
Recurring | 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: 14,867 10,566
Recurring | 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: 3,009 2,430
Recurring | 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: 2,462 1,868
Recurring | 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: 16,508 13,939
Recurring | 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: 3,271 2,821
Recurring | 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: 25,250 21,058
Recurring | 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: 84 90
Recurring | 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: 3,440 3,453
Recurring | 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: 4 4
Recurring | 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
Recurring | 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: 3,619 3,638
Recurring | 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: 30 56
Recurring | 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 3 1
Other 0 0
Total 3 1
Derivative liability 1 0
Total liabilities carried at fair value 1 0
Recurring | 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 3 1
Derivative liability 1 0
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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 0
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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
Recurring | 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 0
Recurring | 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
Recurring | 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
Recurring | 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