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Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill   $ 1,607 $ 1,612 $ 1,612
Accumulated impairment loss   $ 670 $ 670  
Goodwill allocated to the portion of the Private Banking Business Sold $ 5