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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Tax based on federal statutory rate, amount	$ 240	$ 310	$ 313
Tax based on federal statutory rate, percent	21.00%	21.00%	21.00%
State income tax, amount	$ 35	$ 36	$ 35
State income tax, percent	3.10%	2.50%	2.40%
Employee Stock Transactions, amount	$ (1)	$ (3)	$ (3)
Employee Stock Transactions, percent	(0.10%)	(0.20%)	(0.20%)
Affordable housing and historic credits, amount	$ (16)	$ (13)	$ (13)
Affordable housing and historic credits, percent	1.40%	0.90%	0.90%
Bank-owned life insurance, amount	$ (10)	$ (10)	$ (10)
Bank-owned life insurance, percent	(0.90%)	(0.70%)	(0.60%)
FDIC fees, amount	$ 15	$ 6	$ 5
FDIC fees, percent	1.30%	0.40%	0.30%
Tax-related interest and penalties, amount	$ (4)	$ 0	$ 0
Tax-related interest and penalties, percent	(0.40%)	0.00%	0.00%
Other, amount	$ 4	$ (1)	$ (5)
Other, percent	0.40%	(0.10%)	(0.40%)
Provision for income taxes, amount	$ 263	$ 325	$ 322
Provision for income taxes, percent	23.00%	22.00%	21.60%

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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