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Allowances for Loan and Lease Losses (Tables)
 9 Months Ended
Sep. 30, 2018
Allowance For Loan And Lease Losses [Abstract]  
Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data
Table 45: Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data
 
 
2018
 
2017
 
At or for the nine months ended September 30
Dollars in millions
 
Commercial
Lending

 
Consumer
Lending

 
Total

 
Commercial
Lending

 
Consumer
Lending

 
Total

 
Allowance for Loan and Lease Losses
 
 
 
 
 
 
 
 
 
 
 
 
 
January 1
 
$
1,582

 
$
1,029

 
$
2,611

 
$
1,534

 
$
1,055

 
$
2,589

 
Charge-offs
 
(92
)
 
(472
)
 
(564
)
 
(155
)
 
(422
)
 
(577
)
 
Recoveries
 
74

 
177

 
251

 
86

 
157

 
243

 
Net (charge-offs)
 
(18
)
 
(295
)
 
(313
)
 
(69
)
 
(265
)
 
(334
)
 
Provision for credit losses
 
48

 
212

 
260

 
153

 
163

 
316

 
Net decrease / (increase) in allowance for unfunded loan
  commitments and letters of credit
 
7

 
2

 
9

 
9

 
(1
)
 
8

 
Other
 
(1
)
 
18

 
17

 
1

 
25

 
26

 
September 30
 
$
1,618


$
966


$
2,584

 
$
1,628

 
$
977

 
$
2,605

 
TDRs individually evaluated for impairment
 
$
28

 
$
145

 
$
173

 
$
49

 
$
194

 
$
243

 
Other loans individually evaluated for impairment
 
37

 
 
 
37

 
44

 
 
 
44

 
Loans collectively evaluated for impairment
 
1,553

 
547

 
2,100

 
1,515

 
499

 
2,014

 
Purchased impaired loans
 
 
 
274

 
274

 
20

 
284

 
304

 
September 30
 
$
1,618

 
$
966

 
$
2,584

 
$
1,628

 
$
977

 
$
2,605

 
Loan Portfolio
 
 
 
 
 
 
 
 
 
 
 
 
 
TDRs individually evaluated for impairment
 
$
389

 
$
1,497

 
$
1,886

 
$
429

 
$
1,673

 
$
2,102

 
Other loans individually evaluated for impairment
 
206

 
 
 
206

 
289

 
 
 
289

 
Loans collectively evaluated for impairment
 
148,853

 
69,253

 
218,106

 
147,751

 
67,603

 
215,354

 
Fair value option loans (a)
 
 
 
753

 
753

 
 
 
807

 
807

 
Purchased impaired loans
 
 
 
2,102

 
2,102

 
58

 
2,499

 
2,557

 
September 30
 
$
149,448

 
$
73,605

 
$
223,053

 
$
148,527

 
$
72,582

 
$
221,109

 
Portfolio segment ALLL as a percentage of total ALLL
 
63
%
 
37
%
 
100
%
 
62
%
 
38
%
 
100
%
 
Ratio of ALLL to total loans
 
1.08
%
 
1.31
%
 
1.16
%
 
1.10
%
 
1.35
%
 
1.18
%
 
(a)
Loans accounted for under the fair value option are not evaluated for impairment as these loans are accounted for at fair value. Accordingly, there is no allowance recorded on these loans.