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Allowances for Loan and Lease Losses (Tables)
 12 Months Ended
Dec. 31, 2019
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
 
 
2019
2018
2017
At or for the year ended December 31
Dollars in millions
 
Commercial
Lending

 
Consumer
Lending

 
Total

 
Commercial
Lending

 
Consumer
Lending

 
Total

 
Commercial
Lending

 
Consumer
Lending

 
Total

 
Allowance for Loan and Lease Losses
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
January 1
 
$
1,663

 
$
966

 
$
2,629

 
$
1,582

 
$
1,029

 
$
2,611

 
$
1,534

 
$
1,055

 
$
2,589

 
Charge-offs
 
(216
)
 
(758
)
 
(974
)
 
(124
)
 
(640
)
 
(764
)
 
(221
)
 
(565
)
 
(786
)
 
Recoveries
 
78

 
254

 
332

 
99

 
245

 
344

 
116

 
213

 
329

 
Net (charge-offs)
 
(138
)
 
(504
)
 
(642
)
 
(25
)
 
(395
)
 
(420
)
 
(105
)
 
(352
)
 
(457
)
 
Provision for credit losses
 
320

 
453

 
773

 
97

 
311

 
408

 
147

 
294

 
441

 
Net decrease / (increase) in allowance for unfunded loan commitments and letters of credit
 
(34
)
 
1

 
(33
)
 
11

 
1

 
12

 
5

 
(1
)
 
4

 
Other
 
1

 
14

 
15

 
(2
)
 
20

 
18

 
1

 
33

 
34

 
December 31
 
$
1,812

 
$
930

 
$
2,742

 
$
1,663

 
$
966

 
$
2,629

 
$
1,582

 
$
1,029

 
$
2,611

 
TDRs individually evaluated for impairment
 
$
40

 
$
93

 
$
133

 
$
25

 
$
136

 
$
161

 
$
35

 
$
195

 
$
230

 
Other loans individually evaluated for impairment
 
58

 
 
 
58

 
48

 


 
48

 
41

 

 
41

 
Loans collectively evaluated for impairment
 
1,714

 
563

 
2,277

 
1,590

 
555

 
2,145

 
1,506

 
561

 
2,067

 
Purchased impaired loans
 
 
 
274

 
274

 


 
275

 
275

 


 
273

 
273

 
December 31
 
$
1,812

 
$
930

 
$
2,742

 
$
1,663

 
$
966

 
$
2,629

 
$
1,582

 
$
1,029

 
$
2,611

 
Loan Portfolio
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TDRs individually evaluated for impairment
 
$
361

 
$
1,303

 
$
1,664

 
$
409

 
$
1,442

 
$
1,851

 
$
409

 
$
1,652

 
$
2,061

 
Other loans individually evaluated for impairment
 
220

 
 
 
220

 
232

 


 
232

 
310

 

 
310

 
Loans collectively evaluated for impairment
 
160,021

 
75,477

 
235,498

 
151,641

 
69,722

 
221,363

 
146,720

 
68,102

 
214,822

 
Fair value option loans (a)
 
 
 
742

 
742

 


 
782

 
782

 

 
869

 
869

 
Purchased impaired loans
 
 
 
1,719

 
1,719

 


 
2,017

 
2,017

 


 
2,396

 
2,396

 
December 31
 
$
160,602

 
$
79,241

 
$
239,843

 
$
152,282

 
$
73,963

 
$
226,245

 
$
147,439

 
$
73,019

 
$
220,458

 
Portfolio segment ALLL as a percentage of total ALLL
 
66
%
 
34
%
 
100
%
 
63
%
 
37
%
 
100
%
 
61
%
 
39
%
 
100
%
 
Ratio of ALLL to total loans
 
1.13
%
 
1.17
%
 
1.14
%
 
1.09
%
 
1.31
%
 
1.16
%
 
1.07
%
 
1.41
%
 
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.