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Customer Deposits (Details 3) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Time Deposits $250,000 Or More [Line Items]    
Time Deposits, $100,000 or More $ 143 $ 125
United States [Member]    
Time Deposits $250,000 Or More [Line Items]    
Time Deposits, $100,000 or More 126 114
Non Us [Member]    
Time Deposits $250,000 Or More [Line Items]    
Time Deposits, $100,000 or More $ 17 $ 11