v3.25.1
Derivative and Other Hedging Instruments (Summary Of Outstanding Interest Rate Swaps) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
month
Mar. 31, 2024
USD ($)
month
Dec. 31, 2024
USD ($)
Interest Rate Swaps Linked to Overnight Index Swap Rate 15.00%   18.00%
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (1,011) $ 1,102  
Interest Rate Swaps Linked to Secured Overnight Financing Rate 85.00%   82.00%
Interest Rate Swaption [Member]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (19) 33  
Interest Rate Swap [Member]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (569) $ 658  
Notional Amount $ 47,796   $ 39,646
Average Fixed Pay Rate 1.91%   1.46%
Average Receive Rate 4.40%   4.46%
Average Maturity (Years) 5 years 4 years 4 months 24 days  
Receiver Swaption [Member]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 0 $ 0  
Less Than or Equal to One Year [Member] | Interest Rate Swaption [Member]      
Notional Amount $ 2,000   $ 2,000
Average Fixed Pay Rate 4.59%   4.16%
Options At Cost $ 34 $ 23  
Interest Rate Derivatives, at Fair Value, Net $ 16   $ 38
Cash Flow Hedges Derivative Instruments Not Designated As Hedging Instruments Average Months To Expiration | month 10 5  
Average Maturity (Years) 10 years 10 years  
Less Than or Equal to One Year [Member] | Interest Rate Swap [Member]      
Notional Amount $ 9,250   $ 8,500
Average Fixed Pay Rate 0.15%   0.14%
Average Receive Rate 4.38%   4.42%
Average Maturity (Years) 3 months 18 days 6 months  
Less Than or Equal to One Year [Member] | Receiver Swaption [Member]      
Notional Amount     $ 150
Average Fixed Pay Rate     2.98%
Options At Cost   $ 3  
Interest Rate Derivatives, at Fair Value, Net     $ 1
Cash Flow Hedges Derivative Instruments Not Designated As Hedging Instruments Average Months To Expiration | month   11  
Average Maturity (Years)   5 years  
Greater Than One Year and Less Than or Equal to Two Years [Member] | Receiver Swaption [Member]      
Notional Amount $ 150    
Average Fixed Pay Rate 2.98%    
Options At Cost $ 3    
Interest Rate Derivatives, at Fair Value, Net $ 1    
Cash Flow Hedges Derivative Instruments Not Designated As Hedging Instruments Average Months To Expiration | month 8    
Average Maturity (Years) 5 years    
Greater Than One Year and Less Than or Equal to Three Years [Member] | Interest Rate Swap [Member]      
Notional Amount $ 9,800   $ 10,550
Average Fixed Pay Rate 0.21%   0.22%
Average Receive Rate 4.39%   4.45%
Average Maturity (Years) 1 year 7 months 6 days 1 year 9 months 18 days  
Greater Than Three Years and Less Than or Equal to Five Years [Member] | Interest Rate Swap [Member]      
Notional Amount $ 4,800   $ 3,800
Average Fixed Pay Rate 0.36%   0.25%
Average Receive Rate 4.40%   4.49%
Average Maturity (Years) 3 years 10 months 24 days 3 years 10 months 24 days  
Greater Than Five Years and Less than or Equal to Seven Years [Member] | Interest Rate Swap [Member]      
Notional Amount $ 4,450   $ 4,150
Average Fixed Pay Rate 3.03%   2.14%
Average Receive Rate 4.41%   4.46%
Average Maturity (Years) 6 years 5 years 8 months 12 days  
Greater Than Seven Years and Less than or Equal to Ten Years [Member] | Interest Rate Swap [Member]      
Notional Amount $ 19,496   $ 12,646
Average Fixed Pay Rate 3.72%   3.52%
Average Receive Rate 4.41%   4.49%
Average Maturity (Years) 9 years 8 years 9 months 18 days