Fair Value Measurement - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 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	$ 1,700	$ 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	5	5,091
Other investments	1,623	1,344
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	296,142	270,508
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	221	194
Loans Held-for-sale, Fair Value Disclosure	5	118
Other assets	99	325
Total assets	325	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	5	118
Other assets	0	0
Total assets	5	118
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans held for investment	221	194
Loans Held-for-sale, Fair Value Disclosure	0	0
Other assets	99	325
Total assets	320	519
Equity investments subject to Impairment		50
Equity investments accounted for under measurement alternative	5	29
Foreclosed property and repossessed assets, fair value disclosure	56	40
Long lived assets held for sale	35	$ 206
Other investments	$ 3