Customer Deposits (Details 3) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Time Deposits $250,000 Or More [Line Items]
Time Deposits, $100,000 or More	$ 380	$ 285
United States [Member]
Time Deposits $250,000 Or More [Line Items]
Time Deposits, $100,000 or More	373	276
Non Us [Member]
Time Deposits $250,000 Or More [Line Items]
Time Deposits, $100,000 or More	$ 7	$ 9