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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 162,623 $ 160,576
Derivative Asset, Estimated Fair Value 2,231 2,105
Derivative Liability, Estimated Fair Value 3,096 2,691
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements 2,160 2,029
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements 1,802 1,560
Derivative Asset 71 76
Derivative Liability 1,294 1,131
Derivative Asset, Collateral, Obligation to Return Cash, Offset 247 243
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 46 43
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 36,035 34,525
Derivative Asset, Estimated Fair Value 17 65
Derivative Liability, Estimated Fair Value 944 714
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 126,588 126,051
Derivative Asset, Estimated Fair Value 2,214 2,040
Derivative Liability, Estimated Fair Value 2,152 1,977
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 101,364 99,892
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 1,958 1,769
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 1,934 1,718
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 12,288 13,497
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 66 66
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 53 57
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,195 655
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 10 7
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 1 12
Other Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 11,741 12,007
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 180 198
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 164 190
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,985 2,975
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 3 1
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 126 121
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 33,050 31,550
Derivative Asset, Estimated Fair Value 14 64
Derivative Liability, Estimated Fair Value 818 593
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 31,050 29,550
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 4 43
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 809 580
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,000 2,000
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 10 21
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value $ 9 $ 13