Fair Value (Schedule of Assets and Liabilities Measured at Fair Value by Class on a Recurring Basis Using Level 3 Inputs) (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Private equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of assets, Beginning balance	$ 92	$ 81
Transfers out	0	0
Other noninterest income (expense)	0	0
Purchases	7	1
Cost of investments sold	(1)	0
Fair value of assets, Ending balance	98	82
Ag loan servicing
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of assets, Beginning balance	19	14
Transfers out	0	0
Other noninterest income (expense)	0	4
Purchases	0	0
Cost of investments sold	0	0
Fair value of assets, Ending balance	$ 19	$ 18