Income Taxes (Schedule of Tax Effects of Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Gross deferred tax assets:
Book loan loss deduction in excess of tax	$ 157	$ 136
Pension and postretirement	0	1
Deferred compensation	83	77
Security investments and derivative fair value adjustments	1,011	26
Lease liabilities	49	55
Capitalized costs	82	54
Other	29	30
Total deferred tax assets before valuation allowance	1,411	379
Valuation allowance	0	0
Total deferred tax assets	1,411	379
Gross deferred tax liabilities:
Premises and equipment, due to differences in depreciation	(99)	(88)
Federal Home Loan Bank stock dividends	(2)	(2)
Leasing operations	(49)	(44)
Prepaid expenses	(5)	(8)
Prepaid pension reserves	(3)	(6)
Mortgage servicing	(12)	(10)
Deferred loan costs	(34)	(30)
ROU assets	(44)	(49)
Qualified opportunity fund deferred gains	(26)	(26)
Equity investments	(9)	(20)
Total deferred tax liabilities	(283)	(283)
Net deferred tax assets (liabilities)	$ 1,128	$ 96