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Customer Deposits (Details 3) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Time Deposits $250,000 Or More [Abstract]    
U.S. $ 109us-gaap_TimeDeposits100000OrMoreDomestic $ 111us-gaap_TimeDeposits100000OrMoreDomestic
Non-U.S. 17us-gaap_TimeDeposits100000OrMoreForeign 17us-gaap_TimeDeposits100000OrMoreForeign
Total $ 126us-gaap_TimeDeposits100000OrMore $ 128us-gaap_TimeDeposits100000OrMore