Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Debt Instrument [Line Items]
Debt repayments	$ 2,010	$ 17
Senior Notes | Senior Term Loan A-5 due August 1, 2021
Debt Instrument [Line Items]
Debt repayments	1,200
Senior Notes | Senior Term Loan A-1 Facility Due May 10, 2019
Debt Instrument [Line Items]
Debt repayments	200
Senior Notes | 2.75% Senior Notes due June 15, 2017
Debt Instrument [Line Items]
Debt repayments	$ 600
Stated interest rate (as a percent)	2.75%