v3.26.3
FAIR VALUE - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale $ 35,606 $ 31,790
Marketable equity securities 112 127
U.S. Treasury    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 15,582 10,673
Residential mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 17,014 17,623
Commercial mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 2,831 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 35,606 31,790
Marketable equity securities 112 127
Loans held for sale 48 87
Loans 23 22
Total derivative assets 717 534
Total derivative liabilities 807 494
Fair Value, Recurring | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 717 534
Total derivative liabilities 806 494
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 1 0
Fair Value, Recurring | Interest rate contracts | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 555 385
Total derivative liabilities 720 381
Fair Value, Recurring | Foreign exchange contract | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 115 122
Total derivative liabilities 84 113
Fair Value, Recurring | Equity warrants | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 44 27
Fair Value, Recurring | Other derivative | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 3 0
Total derivative liabilities 2 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 52 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 | Equity warrants | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 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 35,586 31,767
Marketable equity securities 60 77
Loans held for sale 48 87
Loans 23 22
Total derivative assets 672 505
Total derivative liabilities 806 494
Fair Value, Recurring | Level 2 | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 672 505
Total derivative liabilities 805 494
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 1 0
Fair Value, Recurring | Level 2 | Interest rate contracts | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 554 383
Total derivative liabilities 719 381
Fair Value, Recurring | Level 2 | Foreign exchange contract | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 115 122
Total derivative liabilities 84 113
Fair Value, Recurring | Level 2 | Equity warrants | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 0 0
Fair Value, Recurring | Level 2 | Other derivative | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 3 0
Total derivative liabilities 2 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 45 29
Total derivative liabilities 1 0
Fair Value, Recurring | Level 3 | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 45 29
Total derivative liabilities 1 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 1 2
Total derivative liabilities 1 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 | Equity warrants | Non-qualifying Hedges    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total derivative assets 44 27
Fair Value, Recurring | Level 3 | 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 | U.S. Treasury    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment securities available for sale 15,582 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 15,582 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 28 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 28 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 17,014 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 17,014 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 2,831 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 2,831 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 121 140
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 101 117
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