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Debt and Secured Revolving Line of Credit (Interest Expense Recognized) (Details) - 2.125% Convertible Senior Notes due 2026 - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Debt Instrument [Line Items]        
Contractual interest expense $ 5 $ 4 $ 13 $ 13
Interest cost related to amortization of debt issuance costs 0 0 1 1
Interest cost related to amortization of the debt discount $ 6 $ 6 $ 18 $ 17