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Goodwill and Other Purchased Intangible Assets (Details 2) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Less accumulated amortization $ (1,800) $ (1,800)
Net contract, program and other intangible assets $ 52 $ 61