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Income Taxes And Tax-Related Items Reconciliation of Expected Income Tax Expense at the Federal Statutory Rate to the Corporation's Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Tax based on federal statutory rate, amount	$ 310	$ 313	$ 130
Tax based on federal statutory rate, percent	21.00%	21.00%	21.00%
State income taxes, amount	$ 36	$ 35	$ 18
State income taxes, percent	2.50%	2.40%	2.90%
Affordable housing and historic credits, amount	$ (13)	$ (13)	$ (12)
Affordable housing and historic credits, percent	(0.90%)	(0.90%)	(1.90%)
Bank-owned life insurance, amount	$ (10)	$ (10)	$ (10)
Bank-owned life insurance, percent	(0.70%)	(0.60%)	(1.60%)
FDIC insurance expense, amount	$ 6	$ 5	$ 7
FDIC insurance expense, percent	0.40%	0.30%	1.10%
Employee Stock Transactions, amount	$ (3)	$ (3)	$ (1)
Employee Stock Transactions, percent	(0.20%)	(0.20%)	(0.20%)
Tax-related interest and penalties, amount	$ 0	$ 0	$ (2)
Tax-related interest and penalties, percent	0.00%	0.00%	(0.30%)
Other, amount	$ (1)	$ (5)	$ (6)
Other, percent	(0.10%)	(0.40%)	(1.00%)
Provision for income taxes, amount	$ 325	$ 322	$ 124
Provision for income taxes, percent	22.00%	21.60%	20.00%

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the interest on income tax liabilities.

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