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Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Provision for income taxes:        
Total provision for income taxes $ 76 $ 104 $ 244 $ 229
Variable Interest Entity        
Provision for income taxes:        
Total provision for income taxes (4) (4) (12) (11)
Low income housing tax credits | Variable Interest Entity        
Provision for income taxes:        
Amortization of LIHTC investments 17 19 51 54
Low income housing tax credits and other tax benefits related to tax credit entities (16) (18) (48) (51)
Other tax benefits related to tax credit entities | Variable Interest Entity        
Provision for income taxes:        
Low income housing tax credits and other tax benefits related to tax credit entities $ (5) $ (5) $ (15) $ (14)