v3.26.1
FAIR VALUE - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale $ 33,983 $ 31,790
Marketable equity securities 156 127
Total derivative assets 508 534
Total derivative liabilities 466 494
U.S. Treasury    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 13,320 10,673
Residential mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 17,500 17,623
Commercial mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 2,972 3,299
Municipal bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 12 12
Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 18 0
Fair Value, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 33,983 31,790
Marketable equity securities 156 127
Loans held for sale 56 87
Loans 24 22
Total derivative assets 508 534
Total derivative liabilities 466 494
Fair Value, Recurring | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 508 534
Total derivative liabilities 463 494
Fair Value, Recurring | Interest rate contracts | Qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 3 0
Fair Value, Recurring | Interest rate contracts | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 349 385
Total derivative liabilities 380 381
Fair Value, Recurring | Foreign exchange contract | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 110 122
Total derivative liabilities 82 113
Fair Value, Recurring | Other derivative | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 49 27
Total derivative liabilities 1 0
Fair Value, Recurring | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Marketable equity securities 69 50
Loans held for sale 0 0
Loans 0 0
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Recurring | Level 1 | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Recurring | Level 1 | Interest rate contracts | Qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Recurring | Level 1 | Interest rate contracts | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Recurring | Level 1 | Foreign exchange contract | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Recurring | Level 1 | Other derivative | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Recurring | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 33,963 31,767
Marketable equity securities 87 77
Loans held for sale 56 87
Loans 24 22
Total derivative assets 458 505
Total derivative liabilities 466 494
Fair Value, Recurring | Level 2 | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 458 505
Total derivative liabilities 463 494
Fair Value, Recurring | Level 2 | Interest rate contracts | Qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 3 0
Fair Value, Recurring | Level 2 | Interest rate contracts | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 347 383
Total derivative liabilities 380 381
Fair Value, Recurring | Level 2 | Foreign exchange contract | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 110 122
Total derivative liabilities 82 113
Fair Value, Recurring | Level 2 | Other derivative | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 1 0
Total derivative liabilities 1 0
Fair Value, Recurring | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 20 23
Marketable equity securities 0 0
Loans held for sale 0 0
Loans 0 0
Total derivative assets 50 29
Total derivative liabilities 0 0
Fair Value, Recurring | Level 3 | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 50 29
Total derivative liabilities 0 0
Fair Value, Recurring | Level 3 | Interest rate contracts | Qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Recurring | Level 3 | Interest rate contracts | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 2 2
Total derivative liabilities 0 0
Fair Value, Recurring | Level 3 | Foreign exchange contract | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 0 0
Fair Value, Recurring | Level 3 | Other derivative | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 48 27
Total derivative liabilities 0 0
Fair Value, Recurring | U.S. Treasury    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 13,320 10,673
Fair Value, Recurring | U.S. Treasury | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | U.S. Treasury | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 13,320 10,673
Fair Value, Recurring | U.S. Treasury | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Government agency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 33 43
Fair Value, Recurring | Government agency | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Government agency | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 33 43
Fair Value, Recurring | Government agency | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Residential mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 17,500 17,623
Fair Value, Recurring | Residential mortgage-backed securities | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Residential mortgage-backed securities | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 17,500 17,623
Fair Value, Recurring | Residential mortgage-backed securities | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Commercial mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 2,972 3,299
Fair Value, Recurring | Commercial mortgage-backed securities | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Commercial mortgage-backed securities | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 2,972 3,299
Fair Value, Recurring | Commercial mortgage-backed securities | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Corporate bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 128 140
Fair Value, Recurring | Corporate bonds | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Corporate bonds | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 108 117
Fair Value, Recurring | Corporate bonds | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 20 23
Fair Value, Recurring | Municipal bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 12 12
Fair Value, Recurring | Municipal bonds | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Municipal bonds | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 12 12
Fair Value, Recurring | Municipal bonds | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 18 0
Fair Value, Recurring | Other | Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 0 0
Fair Value, Recurring | Other | Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 18 0
Fair Value, Recurring | Other | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale $ 0 $ 0