v3.26.3
Derivative Financial Instruments and Hedging Activities - Schedule of Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Notional $ 161,842 $ 167,913
Fair Value of Assets 1,140 1,107
Fair Value of Liabilities 2,097 1,175
Fair value of assets (liabilities) available for offset 805 520
Balance Sheet Location [Axis]: us-gaap:OtherAssets    
Derivatives, Fair Value [Line Items]    
Collateral available for netting against liability positions 1,200 615
Balance Sheet Location [Axis]: us-gaap:OtherLiabilities    
Derivatives, Fair Value [Line Items]    
Collateral held for netting against asset positions 137 44
Interest rate swaps | Fair value hedges | Level 2 | Derivatives designated as hedges    
Derivatives, Fair Value [Line Items]    
Notional 32,554 33,880
Fair Value of Assets 5 88
Fair Value of Liabilities 923 457
Interest rate swaps | Cash flow hedges | Level 2 | Derivatives designated as hedges    
Derivatives, Fair Value [Line Items]    
Notional 2,779 2,302
Fair Value of Assets 18 18
Fair Value of Liabilities 12 23
Foreign currency swaps | Cash flow hedges | Level 2 | Derivatives designated as hedges    
Derivatives, Fair Value [Line Items]    
Notional 8,655 9,226
Fair Value of Assets 311 580
Fair Value of Liabilities 132 58
Interest rate contracts | Level 2 | Derivatives not designated as hedges    
Derivatives, Fair Value [Line Items]    
Notional 117,643 122,505
Fair Value of Assets 806 421
Fair Value of Liabilities 1,030 637
Foreign currency contracts | Level 2 | Derivatives not designated as hedges    
Derivatives, Fair Value [Line Items]    
Notional 211 0
Fair Value of Assets 0 0
Fair Value of Liabilities $ 0 $ 0