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Debt and Secured Revolving Line of Credit (Interest Expense Recognized) (Details) - 2.125% Convertible Senior Notes Due 2026 [Member]
$ in Millions
3 Months Ended
Apr. 01, 2017
USD ($)
Debt Instrument [Line Items]  
Contractual interest expense $ 4
Interest cost related to amortization of debt issuance costs 1
Interest cost related to amortization of the debt discount $ 6