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)