Fair Value Measurement - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 928	$ 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	227	5,091
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	273,434	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	130	194
Loans Held-for-sale, Fair Value Disclosure	123	118
Other assets	45	325
Total assets	298	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	123	118
Other assets	0	0
Total assets	123	118
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	130	194
Loans Held-for-sale, Fair Value Disclosure	0	0
Other assets	45	325
Total assets	175	519
Equity investments subject to Impairment		50
Equity investments accounted for under measurement alternative		29
Foreclosed property and repossessed assets, fair value disclosure	$ 45	40
Long lived assets held for sale		$ 206