Financial Instruments - Credit Facilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2012	Jun. 28, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 82
Line of Credit Facility, Amount Outstanding		0	$ 0
Short-term Bank Loans and Notes Payable		4	7
Long-term Line of Credit		$ 2	$ 3
Revolving credit facility, minimum interest coverage ratio				3.50
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, term	5 years
Revolving credit facility, current borrowing capacity				$ 1,000
Revolving credit facility, covenant compliance ratio, 2014				3.95
Revolving credit facility, covenant compliance ratio, 2015				3.50
Revolving credit facility, covenant compliance ratio, 2016 and thereafter				3.00
Line of credit facility, maximum borrowing capacity				$ 1,500