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Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense related to finite-lived intangible assets $ 11 $ 12 $ 33 $ 37