Fair Value Measurement - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 542	$ 191
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	0	0
Loans Held-for-sale, Fair Value Disclosure	669	11
Other investments	1,326	1,326
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	299,206	302,920
Loans Held-for-sale, Fair Value Disclosure	0	0
Other investments	0	0
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	391	284
Loans Held-for-sale, Fair Value Disclosure	0	11
Other assets	85	220
Total assets	476	515
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	0	0
Loans Held-for-sale, Fair Value Disclosure	0	11
Other assets	0	0
Total assets	0	11
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	391	284
Loans Held-for-sale, Fair Value Disclosure	0	0
Other assets	85	220
Total assets	476	504
Equity investments accounted for under measurement alternative	33	4
Foreclosed property and repossessed assets, fair value disclosure	50	55
Long lived assets held for sale	$ 2	158
Other investments		$ 3