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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 160,576 $ 151,907
Estimated Fair Value, Gain 2,105 2,609
Estimated Fair Value, Loss 2,691 3,378
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements 2,029 2,504
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements 1,560 1,925
Derivative Asset 76 105
Derivative Liability 1,131 1,453
Derivative Asset, Collateral, Obligation to Return Cash, Offset 243 185
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 43 90
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 34,525 32,023
Estimated Fair Value, Gain 65 20
Estimated Fair Value, Loss 714 826
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 126,051 119,884
Estimated Fair Value, Gain 2,040 2,589
Estimated Fair Value, Loss 1,977 2,552
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 99,892 94,220
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 1,769 2,315
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss 1,718 2,335
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 13,497 12,506
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 66 94
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss 57 85
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 655 985
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 7 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 12 5
Other Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 12,007 12,173
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Gain 198 172
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Estimated Fair Value, Loss 190 127
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,975 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 121 158
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 31,550 30,600
Estimated Fair Value, Gain 64 19
Estimated Fair Value, Loss 593 668
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 29,550 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 43 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 580 668
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 21 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 $ 13 $ 0