Business Segment Information - Segments' Total Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segments’ total assets
Total assets	$ 3,169,495	$ 2,819,627
Operating Segments
Segments’ total assets
Total assets	2,955,342	2,555,486
Asset and liability management activities
Segments’ total assets
Total assets	1,363,626	1,176,071
Other
Segments’ total assets
Total assets	67,418	65,755
Elimination of segment asset allocations to match liabilities
Segments’ total assets
Total assets	$ (1,216,891)	$ (977,685)