Annual report pursuant to Section 13 and 15(d)

ACQUISITION OF FIRSTMERIT CORPORATION - Assets Acquired and Liabilities Assumed (Details)

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ACQUISITION OF FIRSTMERIT CORPORATION - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Aug. 16, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets acquired:        
Goodwill   $ 1,993 $ 1,993 $ 677
FirstMerit Bank        
Assets acquired:        
Goodwill $ 1,000      
Business Combination, Consideration Transferred [Abstract]        
Consideration transferred, equity interest issued and issuable 2,800      
Payments to acquired business in cash 800      
FirstMerit Bank | Common Stock        
Business Combination, Consideration Transferred [Abstract]        
Consideration transferred, equity interest issued and issuable 2,800      
FirstMerit Bank | Preferred Stock        
Business Combination, Consideration Transferred [Abstract]        
Consideration transferred, equity interest issued and issuable 100      
FirstMerit Bank | Core deposit intangible        
Assets acquired:        
Intangible assets 310      
FirstMerit Bank | Other        
Assets acquired:        
Intangible assets $ 95