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Business Segment Information - Segments' Total Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Segments’ total assets      
Total assets $ 3,123,198 $ 3,051,375 $ 3,111,606
Operating Segments      
Segments’ total assets      
Total assets 2,860,864   2,974,933
Asset and liability management activities      
Segments’ total assets      
Total assets 1,162,755   1,179,629
Other      
Segments’ total assets      
Total assets 63,153   63,876
Elimination of segment asset allocations to match liabilities      
Segments’ total assets      
Total assets $ (963,574)   $ (1,106,832)