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	Mar. 28, 2015	Dec. 27, 2014
Financial Instrument [Line Items]
Short-term debt (excluding capital leases), at carrying amount	$ 230	$ 172
Short-term debt (excluding capital leases), at estimated fair value	230	173
Long-term debt (excluding capital leases), at carrying amount	2,025	2,025
Long-term debt (excluding capital leases), at estimated fair value	$ 1,906	$ 1,858