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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Private equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of assets, Beginning balance	$ 98	$ 82	$ 92	$ 81
Unrealized securities gains (losses), net	2	(3)	2	(3)
Other noninterest income (expense)	0	0	0	0
Purchases	2	5	9	6
Cost of investments sold	(1)	0	(2)	0
Transfers out	0	0	0	0
Fair value of assets, Ending balance	101	84	101	84
Ag loan servicing
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of assets, Beginning balance	19	18	19	14
Unrealized securities gains (losses), net	0	0	0	0
Other noninterest income (expense)	1	(1)	1	3
Purchases	0	0	0	0
Cost of investments sold	0	0	0	0
Transfers out	0	0	0	0
Fair value of assets, Ending balance	$ 20	$ 17	$ 20	$ 17