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Derivative And Credit-Related Financial Instruments (Schedule Of Weighted Average Maturity And Interest Rates On Risk Management Fair Value Swaps) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Schedule of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps [Line Items]    
Notional/contract amount [1] $ 81,434 $ 70,737
Risk management purposes    
Schedule of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps [Line Items]    
Notional/contract amount [1] 36,860 31,710
Interest rate swap | Fair value swaps - receive fixed/pay floating | Risk management purposes    
Schedule of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps [Line Items]    
Fair value hedge, cumulative increase (decrease)   (93)
Discounted fair value hedge, cumulative increase (decrease) 2 3
Interest rate swap | Fair value swaps - receive fixed/pay floating | Risk management purposes | Long-term Debt    
Schedule of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps [Line Items]    
Carrying value of hedged items [2] $ 6,786 $ 6,206
Time to maturity (in years) 2 years 10 months 24 days 3 years 1 month 6 days
Receive rate [3] 3.77% 3.67%
Pay rate [3] 5.26% 5.74%
[1] Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the Consolidated Balance Sheets.
[2] Included $(8) million and $(93) million of cumulative hedging adjustments at September 30, 2024 and December 31, 2023, respectively, which included $2 million and $3 million, respectively, of hedging adjustment on a discontinued hedging relationship.
[3] Floating rates paid on receive fixed swaps designated as fair value hedges are based on SOFR rates in effect at September 30, 2024 and December 31, 2023.