Customer Deposits (Details 3) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Time Deposits $250,000 Or More [Line Items]
Time Deposits, $100,000 or More	$ 121	$ 124
United States [Member]
Time Deposits $250,000 Or More [Line Items]
Time Deposits, $100,000 or More	113	117
Non Us [Member]
Time Deposits $250,000 Or More [Line Items]
Time Deposits, $100,000 or More	$ 8	$ 7