Other Assets - Summary (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Assets [Abstract]
Goodwill	$ 3,851	$ 3,786	$ 3,804
Other intangible assets, at amortized cost	98	146
Other	15,165	13,757
Total	$ 19,114	$ 17,689