Other Income and Other Expense - Other Income and Other Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other revenues from operations:
Credit-related fee income	$ 162	$ 151	$ 130
Other costs of operations:
Amortization of capitalized mortgage servicing rights	$ 139	131	97
Charitable contributions			178
CIT
Other revenues from operations:
Gain on divestiture		$ 225
MTLA
Other revenues from operations:
Gain on divestiture			$ 136