Debt (Debt Maturity) (Details) - Credit facility - Revolving credit facility $ in Millions	Dec. 30, 2016 USD ($)
Line of Credit Facility [Line Items]
Credit facility borrowing capacity	$ 3,020
Revolving credit facility maturing 2020
Line of Credit Facility [Line Items]
Credit facility borrowing capacity	70
Revolving credit facility maturing 2021
Line of Credit Facility [Line Items]
Credit facility borrowing capacity	70
Revolving credit facility maturing 2022
Line of Credit Facility [Line Items]
Credit facility borrowing capacity	$ 2,880