Fair Value Measurements (Narrative) (Details) - USD ($)	Oct. 03, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in money market mutual funds classified as cash and cash equivalents	$ 1,500,000,000	$ 3,300,000,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Holdings	0	0
Estimate of Fair Value, Fair Value Disclosure | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term debt	$ 4,200,000,000	$ 3,600,000,000