Financial Instruments (Details) (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments not Recorded at Fair Value) (USD $) In Millions, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt (excluding capital leases), at carrying amount	$ 172	$ 55
Short-term debt (excluding capital leases), at estimated fair value	173	55
Long-term debt (excluding capital leases), at carrying amount	2,025	1,986
Long-term debt (excluding capital leases), at estimated fair value	$ 1,858	$ 2,132