Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The components of the provision for income taxes included in the Consolidated Statements of Income for the years ended December 31 are presented in the following table:

(Dollars in millions)	2016		2015			2014
Current income tax provision:
Federal		$667		$707			$365
State	27		36			29
Total	694		743			394
Deferred income tax provision/(benefit):
Federal	59		27			99
State	52		(6		)	—
Total	111		21			99
Total provision for income taxes		$805		$764			$493

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the provision for income taxes, using the statutory federal income tax rate of 35%, to the Company’s actual provision for income taxes and the effective tax rate during the years ended December 31 are presented in the following table:

	2016							2015					2014
(Dollars in millions)	Amount				% of Pre-Tax Income			Amount			% of Pre-Tax Income		Amount			% of Pre-Tax Income
Income tax provision at federal statutory rate		$939			35.0	%			$944		35.0	%		$793		35.0	%
Increase/(decrease) resulting from:
State income taxes, net	53				2.0			25			0.9		12			0.5
Tax-exempt interest	(86		)		(3.2	)		(88		)	(3.3	)	(89		)	(3.9	)
Changes in UTBs (including interest), net	6				0.2			(31		)	(1.1	)	(82		)	(3.6	)
Income tax credits, net of amortization 1	(86		)		(3.2	)		(69		)	(2.6	)	(65		)	(2.9	)
Non-deductible expenses	8				0.3			—			—		(57		)	(2.5	)
Other	(29		)	2	(1.1	)	2	(17		)	(0.6	)	(19		)	(0.8	)
Total provision for income taxes and effective tax rate		$805			30.0	%			$764		28.3	%		$493		21.8	%

¹ Excludes income tax benefits of $2 million, $6 million, and $21 million for the years ended December 31, 2016, 2015, and 2014, respectively, related to tax credits, which were recognized as a reduction to the related investment asset.

² Includes income tax benefits of $15 million related to the Company's early adoption of ASU 2016-09. See Note 1, "Significant Accounting Policies," for additional information.

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The significant DTAs and DTLs at December 31, net of the federal impact for state taxes, are presented in the following table:

(Dollars in millions)	2016			2015
DTAs:
ALLL		$639			$651
Accrued expenses	275			297
State NOLs and other carryforwards	170			192
Net unrealized losses in AOCI	472			257
Other	70			97
Total gross DTAs	1,626			1,494
Valuation allowance	(80		)	(79		)
Total DTAs	1,546			1,415
DTLs:
Leasing	659			707
Compensation and employee benefits	179			140
MSRs	370			372
Loans	142			109
Goodwill and intangible assets	233			216
Fixed assets	113			131
Other	82			65
Total DTLs	1,778			1,740
Net DTL		($232	)		($325	)

Summary of Income Tax Contingencies [Table Text Block]

The following table provides a rollforward of the Company's gross federal and state UTBs, excluding interest and penalties, during the years ended December 31:

(Dollars in millions)	2016			2015
Balance at January 1		$100			$210
Increases in UTBs related to prior years	18			4
Decreases in UTBs related to prior years	(4		)	(4		)
Increases in UTBs related to the current year	13			10
Decreases in UTBs related to settlements	(16		)	(119		)
Decreases in UTBs related to lapse of the applicable statutes of limitations	—			(1		)
Balance at December 31		$111			$100