Fair Value Measurement - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	$ 347	$ 191
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	0	0
Loans held for sale	515	11
Other investments	1,329	1,326
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	308,044	302,920
Loans held for sale	0	0
Other investments	0	0
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	545	284
Loans held for sale	37	11
Other assets	214	220
Total	796	515
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	0	0
Loans held for sale	37	11
Other assets	0	0
Total	37	11
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	545	284
Loans held for sale	0	0
Other assets	214	220
Total	759	504
Equity investments accounted for under measurement alternative	46	4
Foreclosed property and repossessed assets, fair value disclosure	45	55
Other investments		3
Long lived assets held for sale	$ 123	$ 158