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Business Segment Information - Segments' Total Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Segments’ total assets      
Total assets $ 3,153,090 $ 3,051,375 $ 3,072,953
Operating Segments      
Segments’ total assets      
Total assets 2,849,187   2,944,902
Asset and liability management activities      
Segments’ total assets      
Total assets 1,185,910   1,129,824
Other      
Segments’ total assets      
Total assets 63,708   63,284
Elimination of segment asset allocations to match liabilities      
Segments’ total assets      
Total assets $ (945,715)   $ (1,065,057)