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Derivative And Credit-Related Financial Instruments (Schedule Of Derivative Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount $ 71,681 $ 67,665
Fair Value of Gross Derivative Assets 1,178 1,279
Fair Value of Gross Derivative Liabilities 1,508 1,695
Derivative asset, Netting adjustment - Offsetting derivative assets (446) (644)
Derivative liabilities, Netting adjustment - Offsetting derivative assets (446) (644)
Derivative assets, Netting adjustment - Cash collateral received (155) (180)
Derivative liabilities, Netting adjustment, Cash collateral posted (12) (4)
Net derivative assets included in the Consolidated Balance Sheets 577 455
Net derivative liabilities included in the Consolidated Balance Sheets 1,050 1,047
Derivative asset, securities pledged as collateral (295) (70)
Derivative liability, securities pledged as collateral (207) (202)
Net derivative assets after deducting amounts not offset in the Consolidated Balance Sheets 282 385
Net derivative liabilities after deducting amounts not offset in the Consolidated Balance Sheets 843 845
Credit valuation adjustments for counterparty credit risk 2  
Risk management purposes    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 31,962 30,142
Fair Value of Gross Derivative Assets 2 1
Fair Value of Gross Derivative Liabilities 3 53
Risk management purposes | Derivatives designated as hedging instruments | Fair value swaps - receive fixed/pay floating | Swaps    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 6,300 3,150
Fair Value of Gross Derivative Assets 0 0
Fair Value of Gross Derivative Liabilities 0 0
Risk management purposes | Derivatives designated as hedging instruments | Cash flow swaps - receive fixed/pay floating | Swaps    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 25,100 26,600
Fair Value of Gross Derivative Assets 0 0
Fair Value of Gross Derivative Liabilities 2 50
Risk management purposes | Derivatives designated as hedging instruments | Cash flow swaps - receive fixed/pay floating | Forward Starting Swap    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 3,300 4,600
Risk management purposes | Derivatives used as economic hedges | Spot, forwards and swaps    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 562 392
Fair Value of Gross Derivative Assets 2 1
Fair Value of Gross Derivative Liabilities 1 3
Customer-initiated and other activities    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 39,719 37,523
Fair Value of Gross Derivative Assets 1,176 1,278
Fair Value of Gross Derivative Liabilities 1,505 1,642
Customer-initiated and other activities | Interest rate contracts    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 22,265 20,298
Fair Value of Gross Derivative Assets 303 206
Fair Value of Gross Derivative Liabilities 658 594
Customer-initiated and other activities | Caps and floors written    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 1,459 924
Fair Value of Gross Derivative Assets 0 0
Fair Value of Gross Derivative Liabilities 24 25
Customer-initiated and other activities | Caps and floors purchased    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 1,459 924
Fair Value of Gross Derivative Assets 24 25
Fair Value of Gross Derivative Liabilities 0 0
Customer-initiated and other activities | Swaps    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 19,347 18,450
Fair Value of Gross Derivative Assets 279 181
Fair Value of Gross Derivative Liabilities 634 569
Customer-initiated and other activities | Energy contracts    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 14,873 14,521
Fair Value of Gross Derivative Assets 825 1,020
Fair Value of Gross Derivative Liabilities 805 1,006
Customer-initiated and other activities | Caps and floors written    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 4,034 4,051
Fair Value of Gross Derivative Assets 1 0
Fair Value of Gross Derivative Liabilities 319 430
Customer-initiated and other activities | Caps and floors purchased    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 4,034 4,051
Fair Value of Gross Derivative Assets 320 431
Fair Value of Gross Derivative Liabilities 1 0
Customer-initiated and other activities | Swaps    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 6,805 6,419
Fair Value of Gross Derivative Assets 504 589
Fair Value of Gross Derivative Liabilities 485 576
Customer-initiated and other activities | Spot, forwards, options and swaps    
Derivatives, Fair Value [Line Items]    
Notional/Contract Amount 2,581 2,704
Fair Value of Gross Derivative Assets 48 52
Fair Value of Gross Derivative Liabilities $ 42 $ 42