Annual report pursuant to Section 13 and 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details)

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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]        
Goodwill   $ 1,993 $ 1,993 $ 677
Contribution of intangible asset $ 14      
Total other intangible assets, gross carrying amount   515 520  
Total other intangible assets, accumulated amortization   (169) (118)  
Total other intangible assets, net of carrying value   346 402  
Goodwill, Other Increase (Decrease)   0 (5)  
Core deposit intangible        
Finite-Lived Intangible Assets [Line Items]        
Total other intangible assets, gross carrying amount   325 325  
Total other intangible assets, accumulated amortization   (61) (27)  
Total other intangible assets, net of carrying value   264 298  
Customer relationship        
Finite-Lived Intangible Assets [Line Items]        
Total other intangible assets, gross carrying amount   190 195  
Total other intangible assets, accumulated amortization   (108) (91)  
Total other intangible assets, net of carrying value   $ 82 $ 104