Business Segment Information - Segments' Total Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Segments’ total assets
Total assets	$ 3,072,953	$ 3,169,495	$ 3,085,446
Operating Segments
Segments’ total assets
Total assets	2,944,902		2,885,708
Asset and liability management activities
Segments’ total assets
Total assets	1,129,824		1,296,026
Other
Segments’ total assets
Total assets	63,284		65,887
Elimination of segment asset allocations to match liabilities
Segments’ total assets
Total assets	$ (1,065,057)		$ (1,162,175)