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Allowances for Loan and Lease Losses (Tables)
 12 Months Ended
Dec. 31, 2017
Allowance For Loan And Lease Losses [Abstract]  
Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data
Table 46: Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data
Dollars in millions
 
Commercial
Lending

 
Consumer
Lending

 
Total

 
December 31, 2017
 
 
 
 
 
 
 
Allowance for Loan and Lease Losses
 
 
 
 
 
 
 
January 1
 
$
1,534

 
$
1,055

 
$
2,589

 
Charge-offs
 
(221
)
 
(565
)
 
(786
)
 
Recoveries
 
116

 
213

 
329

 
Net (charge-offs)
 
(105
)
 
(352
)
 
(457
)
 
Provision for credit losses
 
147

 
294

 
441

 
Net decrease / (increase) in allowance for unfunded loan commitments
    and letters of credit
 
5

 
(1
)
 
4

 
Other
 
1

 
33

 
34

 
December 31
 
$
1,582

 
$
1,029

 
$
2,611

 
TDRs individually evaluated for impairment
 
$
35

 
$
195

 
$
230

 
Other loans individually evaluated for impairment
 
41

 
 
 
41

 
Loans collectively evaluated for impairment
 
1,506

 
561

 
2,067

 
Purchased impaired loans
 
 
 
273

 
273

 
December 31
 
$
1,582

 
$
1,029

 
$
2,611

 
Loan Portfolio
 
 
 
 
 
 
 
TDRs individually evaluated for impairment
 
$
409

 
$
1,652

 
$
2,061

 
Other loans individually evaluated for impairment
 
310

 
 
 
310

 
Loans collectively evaluated for impairment
 
146,720

 
68,102

 
214,822

 
Fair value option loans (a)
 
 
 
869

 
869

 
Purchased impaired loans
 
 
 
2,396

 
2,396

 
December 31
 
$
147,439

 
$
73,019

 
$
220,458

 
Portfolio segment ALLL as a percentage of total ALLL
 
61
%
 
39
%
 
100
%
 
Ratio of the allowance for loan and lease losses to total loans
 
1.07
%
 
1.41
%
 
1.18
%
 
December 31, 2016
 
 
 
 
 
 
 
Allowance for Loan and Lease Losses
 
 
 
 
 
 
 
January 1
 
$
1,605

 
$
1,122

 
$
2,727

 
Charge-offs
 
(363
)
 
(523
)
 
(886
)
 
Recoveries
 
178

 
165

 
343

 
Net (charge-offs)
 
(185
)
 
(358
)
 
(543
)
 
Provision for credit losses
 
153

 
280

 
433

 
Net (increase) in allowance for unfunded loan commitments and letters of
    credit
 
(39
)
 
(1
)
 
(40
)
 
Other
 


 
12

 
12

 
December 31
 
$
1,534

 
$
1,055

 
$
2,589

 
TDRs individually evaluated for impairment
 
$
45

 
$
226

 
$
271

 
Other loans individually evaluated for impairment
 
60

 


 
60

 
Loans collectively evaluated for impairment
 
1,392

 
546

 
1,938

 
Purchased impaired loans
 
37

 
283

 
320

 
December 31
 
$
1,534

 
$
1,055

 
$
2,589

 
Loan Portfolio
 
 
 
 
 
 
 
TDRs individually evaluated for impairment
 
$
428

 
$
1,793

 
$
2,221

 
Other loans individually evaluated for impairment
 
371

 


 
371

 
Loans collectively evaluated for impairment
 
137,047

 
67,345

 
204,392

 
Fair value option loans (a)
 


 
893

 
893

 
Purchased impaired loans
 
109

 
2,847

 
2,956

 
December 31
 
$
137,955

 
$
72,878

 
$
210,833

 
Portfolio segment ALLL as a percentage of total ALLL
 
59
%
 
41
%
 
100
%
 
Ratio of the allowance for loan and lease losses to total loans (b)
 
1.11
%
 
1.45
%
 
1.23
%
 
In millions
 
Commercial
Lending

 
Consumer
Lending

 
Total

 
December 31, 2015
 
 
 
 
 
 
 
Allowance for Loan and Lease Losses
 
 
 
 
 
 
 
January 1
 
$
1,571

 
$
1,760

 
$
3,331

 
Charge-offs
 
(255
)
 
(550
)
 
(805
)
 
Recoveries
 
240

 
179

 
419

 
Net charge-offs
 
(15
)
 
(371
)
 
(386
)
 
Provision for credit losses
 
55

 
200

 
255

 
Net (increase) / decrease in allowance for unfunded loan commitments
    and letters of credit
 
(3
)
 
1

 
(2
)
 
Other (b)
 
(3
)
 
(468
)
 
(471
)
 
December 31
 
$
1,605

 
$
1,122

 
$
2,727

 
TDRs individually evaluated for impairment
 
$
43

 
$
276

 
$
319

 
Other loans individually evaluated for impairment
 
76

 

 
76

 
Loans collectively evaluated for impairment
 
1,437

 
585

 
2,022

 
Purchased impaired loans
 
49

 
261

 
310

 
December 31
 
$
1,605

 
$
1,122

 
$
2,727

 
Loan Portfolio
 
 
 
 
 
 
 
TDRs individually evaluated for impairment
 
$
434

 
$
1,917

 
$
2,351

 
Other loans individually evaluated for impairment
 
309

 

 
309

 
Loans collectively evaluated for impairment
 
132,632

 
66,977

 
199,609

 
Fair value option loans (a)
 

 
905

 
905

 
Purchased impaired loans
 
169

 
3,353

 
3,522

 
December 31
 
$
133,544

 
$
73,152

 
$
206,696

 
Portfolio segment ALLL as a percentage of total ALLL
 
59
%
 
41
%
 
100
%
 
Ratio of the allowance for loan and lease losses to total loans
 
1.20
%
 
1.53
%
 
1.32
%
 
(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.
(b)
Includes $468 million in write-offs of purchased impaired loans due to the change in derecognition policy effective December 31, 2015 for certain consumer purchased impaired loans. See Note 1 Accounting Policies in our 2015 Form 10-K for additional information.