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Debt and Credit Facilities (Convertible Notes) (Details)		3 Months Ended
	Aug. 25, 2015 USD ($) $ / shares	Apr. 02, 2016 USD ($)	Feb. 19, 2016 USD ($)	Dec. 31, 2015 USD ($)
Senior Convertible Notes \| Silver Lake Partners \| Convertible Notes
Debt Instrument [Line Items]
Convertible note issued	$ 1,000,000,000
Interest rate	2.00%
Term of to maturity	2 years
Conversion rate	0.0145985
Effective conversion price of convertible shares (US$ per share) \| $ / shares	$ 68.50
Discount rate		2.40%
Debt liability		$ 992,000,000
Discount of debt liability		8,000,000
Fair value of debt liability recorded within additional paid in capital		8,000,000
Airwave \| Term Loan Agreement \| Term Loan
Debt Instrument [Line Items]
Convertible note issued			$ 675,000,000
Long-term Debt
Debt Instrument [Line Items]
Debt issuance costs presented as a component of long-term debt		$ 40,000,000		$ 41,000,000