Quarterly report pursuant to Section 13 or 15(d)

Debt and Secured Revolving Line of Credit (Interest Expense Recognized) (Details)

v3.8.0.1
Debt and Secured Revolving Line of Credit (Interest Expense Recognized) (Details) - 2.125% Convertible Senior Notes Due 2026 [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Debt Instrument [Line Items]        
Contractual interest expense $ 4 $ 0 $ 13 $ 0
Interest cost related to amortization of debt issuance costs 0 0 1 0
Interest cost related to amortization of the debt discount $ 6 $ 1 $ 17 $ 1