Fair Value Measurement - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 767	$ 1,000
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	110	5,091
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	287,254	270,508
Loans Held-for-sale, Fair Value Disclosure	0	0
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	205	194
Loans Held-for-sale, Fair Value Disclosure	91	118
Other assets	91	325
Total assets	387	637
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	91	118
Other assets	0	0
Total assets	91	118
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	205	194
Loans Held-for-sale, Fair Value Disclosure	0	0
Other assets	91	325
Total assets	296	519
Equity investments subject to Impairment		50
Equity investments accounted for under measurement alternative	1	29
Foreclosed property and repossessed assets, fair value disclosure	52	40
Long lived assets held for sale	$ 38	$ 206