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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Schedule of Property, Plant and Equipment
Premises & Equipment
 
Useful Lives
Buildings and improvement
 
5-39 years
Furniture and equipment
 
3-10 years
Computer software
 
3-5 years
Leasehold improvements
 
Lesser of useful life or the remaining
fixed non-cancelable lease term
Premises and equipment as of December 31, 2016 and 2015 were as follows:
Table 8.1: Components of Premises and Equipment
 
 
December 31,
(Dollars in millions)
 
2016
 
2015
Land
 
$
423

 
$
458

Buildings and improvements
 
2,958

 
2,674

Furniture and equipment
 
1,834

 
1,735

Computer software
 
1,681

 
1,618

In progress
 
591

 
514

Total premises and equipment, gross
 
7,487

 
6,999

Less: Accumulated depreciation and amortization
 
(3,812
)
 
(3,415
)
Total premises and equipment, net
 
$
3,675

 
$
3,584