Restructuring Costs - Restructuring Liability (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Restructuring Reserve [Roll Forward]
Costs Expensed, net of reversals	$ 190	$ 57
Restructuring Liability, ending balance	464
Fiscal 2018 Plan
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	0
Costs Expensed, net of reversals	204
Costs Not Affecting Restructuring Liability	(7)
Cash Paid	(71)
Other	1
Restructuring Liability, ending balance	127
Fiscal 2018 Plan | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	0
Costs Expensed, net of reversals	135
Costs Not Affecting Restructuring Liability	(2)
Cash Paid	(49)
Other	3
Restructuring Liability, ending balance	87
Fiscal 2018 Plan | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	0
Costs Expensed, net of reversals	69
Costs Not Affecting Restructuring Liability	(5)
Cash Paid	(22)
Other	(2)
Restructuring Liability, ending balance	40
Fiscal 2017 Plan
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	161
Costs Expensed, net of reversals	(10)
Costs Not Affecting Restructuring Liability	0
Cash Paid	(49)
Other	(2)
Restructuring Liability, ending balance	100
Costs reversed	10
Fiscal 2017 Plan | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	155
Costs Expensed, net of reversals	(6)
Costs Not Affecting Restructuring Liability	0
Cash Paid	(47)
Other	(4)
Restructuring Liability, ending balance	98
Fiscal 2017 Plan | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	6
Costs Expensed, net of reversals	(4)
Costs Not Affecting Restructuring Liability	0
Cash Paid	(2)
Other	2
Restructuring Liability, ending balance	2
Fiscal 2016 Plan
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	13
Costs Expensed, net of reversals	(1)
Costs Not Affecting Restructuring Liability	0
Cash Paid	(4)
Other	0
Restructuring Liability, ending balance	8
Costs reversed	1
Fiscal 2016 Plan | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	8
Costs Expensed, net of reversals	(1)
Costs Not Affecting Restructuring Liability	0
Cash Paid	(1)
Other	0
Restructuring Liability, ending balance	6
Fiscal 2016 Plan | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	5
Costs Expensed, net of reversals	0
Costs Not Affecting Restructuring Liability	0
Cash Paid	(3)
Other	0
Restructuring Liability, ending balance	2
Fiscal 2015 Plan
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	3
Costs Expensed, net of reversals	0
Costs Not Affecting Restructuring Liability	0
Cash Paid	(1)
Other	0
Restructuring Liability, ending balance	2
Fiscal 2015 Plan | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	3
Costs Expensed, net of reversals	0
Costs Not Affecting Restructuring Liability	0
Cash Paid	(1)
Other	0
Restructuring Liability, ending balance	2
Fiscal 2015 Plan | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	0
Costs Expensed, net of reversals	0
Costs Not Affecting Restructuring Liability	0
Cash Paid	0
Other	0
Restructuring Liability, ending balance	0
Acquired Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	333
Costs Expensed, net of reversals	(3)
Costs Not Affecting Restructuring Liability	(1)
Cash Paid	(106)
Other	4
Restructuring Liability, ending balance	227
Costs reversed	4
Acquired Liabilities | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	256
Costs Expensed, net of reversals	1
Costs Not Affecting Restructuring Liability	(1)
Cash Paid	(91)
Other	4
Restructuring Liability, ending balance	169
Acquired Liabilities | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance	77
Costs Expensed, net of reversals	(4)
Costs Not Affecting Restructuring Liability	0
Cash Paid	(15)
Other	0
Restructuring Liability, ending balance	$ 58