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Fair Value and Investment Securities Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-term Debt, Fair Value $ 1,500 $ 1,500
Long-term Debt, Carrying Value 1,495 1,494
Restricted cash for litigation settlement 541 540
Held-to-maturity Securities, Time Deposits $ 364 $ 70