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Business Segment Information - Segments' Total Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Segments’ total assets      
Total assets $ 3,111,606 $ 3,169,495 $ 3,029,894
Operating Segments      
Segments’ total assets      
Total assets 2,974,933   2,823,553
Asset and liability management activities      
Segments’ total assets      
Total assets 1,179,629   1,250,633
Other      
Segments’ total assets      
Total assets 63,876   67,208
Elimination of segment asset allocations to match liabilities      
Segments’ total assets      
Total assets $ (1,106,832)   $ (1,111,500)