Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Narrative) (Details)

v3.7.0.1
Financial Instruments (Narrative) (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($)
$ in Millions
Jul. 01, 2017
Dec. 31, 2016
Money Market Funds [Member]    
Schedule of Investments [Line Items]    
Investment in money market fund used as collateral $ 2 $ 2
Mutual Funds [Member]    
Schedule of Investments [Line Items]    
Restricted investments $ 16 $ 15