Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in the carrying amount of goodwill
Goodwill	$ 3,225	$ 3,225	$ 3,225
Regional Bank
Changes in the carrying amount of goodwill
Goodwill	2,134	2,126
Commercial Banking
Changes in the carrying amount of goodwill
Goodwill	410	407
Transaction Banking
Changes in the carrying amount of goodwill
Goodwill	251	251
Investment Banking and Markets
Changes in the carrying amount of goodwill
Goodwill	430	427
Asian Corporate Banking
Changes in the carrying amount of goodwill
Goodwill	$ 0	$ 14