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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 160,792 $ 151,907
Estimated Fair Value, Gain 2,979 2,609
Estimated Fair Value, Loss 4,226 3,378
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements 2,924 2,504
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements 2,490 1,925
Derivative Asset 55 105
Derivative Liability 1,736 1,453
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 32,823 32,023
Estimated Fair Value, Gain 27 20
Estimated Fair Value, Loss 1,307 826
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 127,969 119,884
Estimated Fair Value, Gain 2,952 2,589
Estimated Fair Value, Loss 2,919 2,552
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 103,527 94,220
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 2,716 2,315
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss 2,709 2,335
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 11,979 12,506
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 84 94
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss 73 85
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 591 985
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 8 8
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss 7 5
Other Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 11,872 12,173
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 144 172
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss 130 127
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,523 1,423
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 1 1
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss 154 158
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 31,300 30,600
Estimated Fair Value, Gain 26 19
Estimated Fair Value, Loss 1,153 668
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 29,300 30,600
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 11 19
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss 1,133 668
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,000 0
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 15 0
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss $ 20 $ 0