Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Assets [Abstract]
Goodwill	$ 3,804	$ 3,852	$ 3,315
Other intangible assets, at amortized cost	201	265
Other	13,239	13,562
Total	$ 17,244	$ 17,679