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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2017
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)
2017
 
2016
 
2015
Current income tax provision:
 
 
 
 
 
Federal

$129

 

$667

 

$707

State
59

 
27

 
36

Total
188

 
694

 
743

Deferred income tax provision/(benefit):
 
 
 
 
 
Federal
275

 
59

 
27

State
69

 
52

 
(6
)
Total
344

 
111

 
21

Total provision for income taxes

$532

 

$805

 

$764
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
A reconciliation of the income tax provision, 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:
 
2017
 
2016
 
2015
(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

$982

 
35.0
 %
 

$939

 
35.0
 %
 

$944

 
35.0
 %
Increase/(decrease) resulting from:
 
 
 
 
 
 
 
 
 
 
 
State income taxes, net
66

 
2.4

 
53

 
2.0

 
25

 
0.9

Tax-exempt interest
(90
)
 
(3.2
)
 
(86
)
 
(3.2
)
 
(88
)
 
(3.3
)
Changes in UTBs (including interest), net
26

 
0.9

 
6

 
0.2

 
(31
)
 
(1.1
)
Income tax credits, net of amortization 1
(117
)
 
(4.2
)
 
(86
)
 
(3.2
)
 
(69
)
 
(2.6
)
Estimated impact of the remeasurement of DTAs and DTLs
and other tax reform-related items 2
(303
)
 
(10.8
)
 
—

 
—

 
—

 
—

Other 3
(32
)
 
(1.1
)
 
(21
)
 
(0.8
)
 
(17
)
 
(0.6
)
Total provision for income taxes and effective tax rate

$532

 
19.0
 %
 

$805

 
30.0
 %
 

$764

 
28.3
 %
1 Excludes income tax benefits of $43 million, $2 million, and $6 million for the years ended December 31, 2017, 2016, and 2015, respectively, related to tax credits, which were recognized as a reduction to the related investment asset.
2 Includes reasonable estimates as of December 31, 2017, which could be adjusted as additional analysis is completed in 2018.
3 Includes excess tax benefits of $25 million and $15 million for the years ended December 31, 2017 and 2016, respectively, related to the Company's adoption of ASU 2016-09.
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)
  2017 1
 
  2016 2
DTAs:
 
 
 
ALLL

$412

 

$639

Net unrealized losses in AOCI
302

 
472

State NOLs and other carryforwards
227

 
170

Accruals and reserves
180

 
343

Other
17

 
19

Total gross DTAs
1,138

 
1,643

Valuation allowance
(143
)
 
(80
)
Total DTAs
995

 
1,563

DTLs:
 
 
 
Leasing
459

 
659

Servicing rights
290

 
370

Employee compensation and benefits
210

 
179

Deferred income
193

 
22

Goodwill and other intangible assets
155

 
233

Fixed assets
111

 
113

Loans
104

 
176

Other
41

 
43

Total DTLs
1,563

 
1,795

Net DTL

($568
)
 

($232
)
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)
2017
 
2016
Balance at January 1

$111

 

$100

Increases in UTBs related to prior years
22

 
18

Decreases in UTBs related to prior years
(5
)
 
(4
)
Increases in UTBs related to the current year
13

 
13

Decreases in UTBs related to settlements
—

 
(16
)
Balance at December 31

$141

 

$111