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Summary of Significant Accounting Policies and Nature of Operations (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
As a result of adopting ASU 2017-07, the salaries and employee benefits expense and other expense categories in noninterest expense have been adjusted to reflect adoption of this guidance as follows.
 
 
For the Year Ended
 
For the Year Ended
 
 
2017
 
2016
(Dollars in millions)
 
As Previously Reported
 
Adjustment
 
As Reported under New Guidance
 
As Previously Reported
 
Adjustment
 
As Reported under New Guidance
Salaries and employee benefits
 
$
2,376

 
$
119

 
$
2,495

 
$
2,355

 
$
84

 
$
2,439

Other
 
508

 
(119
)
 
389

 
479

 
(84
)
 
395