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Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 10,139 $ 9,726  
Current period change (2,008) (523) $ 507
Balance 8,441 10,139 9,726
URA(D) On Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 239 724  
Current period change (1,948) (485)  
Balance (1,709) 239 724
Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (177) (115)  
Current period change (77) (62)  
Balance (254) (177) (115)
Benefit Plan Net Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (50) (74)  
Current period change 17 23  
Balance (33) (50) (74)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 12 535 28
Current period change (2,008) (523) 507
Balance $ (1,996) $ 12 $ 535