v3.25.3
Fair Value - Schedule of Financial Assets and Liabilities Carried at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets $ 884 $ 768
Available-for-sale investment securities: 69,443 58,895
Derivative Asset, Total 3,554 11,183
Cash collateral provided 779 1,860
Cash collateral received 1,207 6,103
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 884 768
Available-for-sale investment securities: 69,443 58,895
Derivative asset, Impact of Netting (7,355) (18,285)
Derivative Asset, Total 3,554 11,183
Other 740 767
Other, Impact of Netting 0 0
Total 74,621 71,613
Derivative liability, Impact of Netting (7,783) (22,528)
Derivative liabilities 3,107 6,596
Total liabilities carried at fair value 3,107 6,596
Recurring | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, Impact of Netting (7,320) (18,262)
Derivative Asset, Total 3,554 11,177
Derivative liability, Impact of Netting (7,781) (22,527)
Derivative liabilities 2,928 6,377
Recurring | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, Impact of Netting (35) (23)
Derivative Asset, Total 0 5
Derivative liability, Impact of Netting (2) (1)
Derivative liabilities 1 0
Recurring | Other derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, Impact of Netting   0
Derivative Asset, Total   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 178 219
Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 90 34
Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 128 121
Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 666 613
Available-for-sale investment securities: 3 52
Recurring | Direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 24,153 23,525
Recurring | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 15,551 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: 39,704 34,091
Recurring | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,792 2,430
Recurring | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,380 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: 18,464 13,939
Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 3,062 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: 26,698 21,058
Recurring | Student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 81 90
Recurring | Collateralized loan obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities: 2,836 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: 3,012 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: 26 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 90 34
Available-for-sale investment securities: 24,153 23,525
Derivative asset 0 22
Other 22 20
Total 24,265 23,601
Derivative liability 0 0
Total liabilities carried at fair value 0 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 0 16
Derivative liability 0 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 0 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 0 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 90 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: 24,153 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: 24,153 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 794 734
Available-for-sale investment securities: 45,290 35,370
Derivative asset 10,907 29,445
Other 718 747
Total 57,709 66,296
Derivative liability 10,889 29,124
Total liabilities carried at fair value 10,889 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 10,872 29,422
Derivative liability 10,708 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 35 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 178 219
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 128 121
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 666 613
Available-for-sale investment securities: 3 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: 15,551 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: 15,551 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: 2,792 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: 2,380 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: 18,464 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: 3,062 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: 26,698 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: 81 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: 2,836 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: 3,012 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: 26 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 2 1
Other 0 0
Total 2 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 2 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