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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
 
2017
 
2016
Current income tax provision:
 
 
 
 
 
Federal

$562

 

$129

 

$667

State
73

 
59

 
27

Total
635

 
188

 
694

Deferred income tax (benefit)/provision:
 
 
 
 
 
Federal
(122
)
 
275

 
59

State
35

 
69

 
52

Total
(87
)
 
344

 
111

Total provision for income taxes

$548

 

$532

 

$805
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] A reconciliation of the income tax provision at the statutory federal income tax rate to the Company’s actual provision for income taxes and actual effective tax rate for the years ended December 31 are presented in the following table:
 
2018
 
2017
 
2016
(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

$698

 
21.0
 %
 

$982

 
35.0
 %
 

$939

 
35.0
 %
Increase/(decrease) resulting from:
 
 
 
 
 
 
 
 
 
 
 
State income taxes, net
85

 
2.6

 
92

 
3.3

 
59

 
2.2

Tax-exempt interest
(67
)
 
(2.0
)
 
(90
)
 
(3.2
)
 
(86
)
 
(3.2
)
Income tax credits, net of amortization 1
(106
)
 
(3.2
)
 
(117
)
 
(4.2
)
 
(86
)
 
(3.2
)
Impact of the remeasurement of DTAs and DTLs
and other tax reform-related items
(55
)
 
(1.7
)
 
(303
)
 
(10.8
)
 
—

 
—

Other 2
(7
)
 
(0.2
)
 
(32
)
 
(1.1
)
 
(21
)
 
(0.8
)
Total provision for income taxes and effective tax rate

$548

 
16.5
 %
 

$532

 
19.0
 %
 

$805

 
30.0
 %
1 
Excludes income tax benefits of $84 million, $34 million, and $1 million for the years ended December 31, 2018, 2017, and 2016, respectively, related to tax credits, which were recognized as a reduction to the related investment asset.
2 
Includes excess tax benefits of $22 million, $25 million, and $15 million for the years ended December 31, 2018, 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)
2018
 
2017
DTAs:
 
 
 
ALLL

$376

 

$412

Net unrealized losses in AOCI
438

 
302

State NOLs and other carryforwards
111

 
227

Accruals and reserves
145

 
180

Other
21

 
17

Total gross DTAs
1,091

 
1,138

Valuation allowance
(85
)
 
(143
)
Total DTAs
1,006

 
995

DTLs:
 
 
 
Leasing
475

 
459

Servicing rights
270

 
290

Employee compensation and benefits
140

 
210

Deferred income
29

 
193

Goodwill and other intangible assets
156

 
155

Premises, property, and equipment
149

 
111

Loans
96

 
104

Other
38

 
41

Total DTLs
1,353

 
1,563

Net DTL

($347
)
 

($568
)
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)
2018
 
2017
Balance at January 1

$141

 

$111

Increases in UTBs related to prior years
2

 
22

Decreases in UTBs related to prior years
(6
)
 
(5
)
Increases in UTBs related to the current year
20

 
13

Decreases in UTBs related to settlements
(2
)
 
—

Decreases in UTBs related to lapse of the applicable statutes of limitations
(10
)
 
—

Balance at December 31

$145

 

$141