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Income Taxes (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ 547	$ 604	$ 675
Effective Income Tax Rate, Continuing Operations	20.50%	22.00%	21.60%
Increase (decrease) in taxes resulting from: [Abstract]
State income tax, net of federal tax effect	$ 72	$ 88	$ 83
Non-deductible expenses	33	34	18
Tax-exempt interest	(38)	(33)	(30)
Affordable housing investment amortization, net of tax benefits (excluding Tax Reform)	(42)	(32)	(25)
Bank-owned life insurance	(19)	(16)	(20)
Other, net	(20)	(14)	(7)
Income tax expense	$ 533	$ 631	$ 694

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Effective Income Tax Rate Reconciliation, Bank-Owned Life Insurance, Amount

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Increase (decrease) in taxes resulting from: [Abstract]

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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