Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]

Schedule Of Income Taxes (Benefit)

(In millions)	2017		2016			2015
Federal:
Current	$	166	$	217		$	158
Deferred	146		(4		)	(32		)
Total Federal	312		213			126
State:
Current	24		27			14
Deferred	8		(4		)	2
Total State	32		23			16
Total	$	344	$	236		$	142

Schedule Of Statutory Federal Income Tax Rate Reconciles To Actual Income Tax Expense (Benefit)

(In millions)	2017			2016			2015
Income tax expense at statutory federal rate	$	327		$	247		$	158
State income taxes including credits, net	21			15			10
Other nondeductible expenses	3			3			3
Nontaxable income	(33		)	(25		)	(20		)
Share-based compensation	(8		)	—			—
Tax credits and other taxes	1			(2		)	(3		)
Tax Cuts and Jobs Act of 2017	47			—			—
Other	(14		)	(2		)	(6		)
Total	$	344		$	236		$	142

Schedule Of Tax Effects Of Deferred Tax Assets And Deferred Tax Liabilities

(In millions)	December 31,
	2017			2016
Gross deferred tax assets:
Book loan loss deduction in excess of tax	$	143		$	241
Pension and postretirement	8			19
Deferred compensation	48			87
Security investments and derivative fair value adjustments	40			57
Net operating losses, capital losses and tax credits	2			5
FDIC-supported transactions	2			5
Other	34			46
	277			460
Valuation allowance	(2		)	(4		)
Total deferred tax assets	275			456
Gross deferred tax liabilities:
Core deposits and purchase accounting	—			(1		)
Premises and equipment, due to differences in depreciation	(51		)	(8		)
Federal Home Loan Bank stock dividends	(3		)	(4		)
Leasing operations	(52		)	(75		)
Prepaid expenses	(5		)	(7		)
Prepaid pension reserves	(11		)	(17		)
Mortgage servicing	(7		)	(10		)
Subordinated debt modification	(9		)	(31		)
Deferred loan fees	(23		)	(25		)
Equity investments	(21		)	(28		)
Total deferred tax liabilities	(182		)	(206		)
Net deferred tax assets	$	93		$	250

Schedule Of Reconciliation Of Gross Unrecognized Tax Benefits

(In millions)	2017		2016			2015
Balance at beginning of year	$	4	$	5		$	3
Tax positions related to current year:
Additions	1		1			1
Reductions	—		—			—
Tax positions related to prior years:
Additions	1		1			1
Reductions	—		—			—
Settlements with taxing authorities	—		—			—
Lapses in statutes of limitations	—		(3		)	—
Balance at end of year	$	6	$	4		$	5