Fair Value Measurement - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 358	$ 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	5	11
Other investments	1,327	1,326
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	300,206	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	204	284
Loans Held-for-sale, Fair Value Disclosure		11
Other assets	51	220
Total assets	255	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		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	204	284
Loans Held-for-sale, Fair Value Disclosure		0
Other assets	51	220
Total assets	255	504
Equity investments accounted for under measurement alternative	6	4
Foreclosed property and repossessed assets, fair value disclosure	$ 45	55
Long lived assets held for sale		158
Other investments		$ 3