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)