Business Segment Information - Segments' Total Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Segments’ total assets
Total assets	$ 3,194,657	$ 3,051,375	$ 3,238,223
Operating Segments
Segments’ total assets
Total assets	2,927,034		3,106,037
Asset and liability management activities
Segments’ total assets
Total assets	1,229,425		1,281,639
Other
Segments’ total assets
Total assets	62,394		66,948
Elimination of segment asset allocations to match liabilities
Segments’ total assets
Total assets	$ (1,024,196)		$ (1,216,401)