Restructuring Costs - Restructuring Liability (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 30, 2016	Dec. 31, 2017	Dec. 30, 2016
Restructuring Reserve [Roll Forward]
Costs Expensed, net of reversals	$ 213	$ 3	$ 595	$ 85
Restructuring Liability, ending balance	516		516
Fiscal 2018 Plan
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			0
Costs Expensed, net of reversals			625
Costs Not Affecting Restructuring Liability			(28)
Cash Paid			(298)
Other			7
Restructuring Liability, ending balance	306		306
Fiscal 2018 Plan | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			0
Costs Expensed, net of reversals			451
Costs Not Affecting Restructuring Liability			(13)
Cash Paid			(228)
Other			6
Restructuring Liability, ending balance	216		216
Fiscal 2018 Plan | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			0
Costs Expensed, net of reversals			174
Costs Not Affecting Restructuring Liability			(15)
Cash Paid			(70)
Other			1
Restructuring Liability, ending balance	90		90
Fiscal 2017 Plan
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			161
Costs Expensed, net of reversals			(27)
Costs Not Affecting Restructuring Liability			(6)
Cash Paid			(95)
Other			10
Restructuring Liability, ending balance	43		43
Costs reversed			29
Fiscal 2017 Plan | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			155
Costs Expensed, net of reversals			(25)
Costs Not Affecting Restructuring Liability			(6)
Cash Paid			(91)
Other			10
Restructuring Liability, ending balance	43		43
Fiscal 2017 Plan | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			6
Costs Expensed, net of reversals			(2)
Costs Not Affecting Restructuring Liability			0
Cash Paid			(4)
Other			0
Restructuring Liability, ending balance	0		0
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			(6)
Other			0
Restructuring Liability, ending balance	6		6
Costs reversed			2
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			(3)
Other			0
Restructuring Liability, ending balance	4		4
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		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			(2)
Other			0
Restructuring Liability, ending balance	1		1
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			(2)
Other			0
Restructuring Liability, ending balance	1		1
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		0
Acquired Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			328
Costs Expensed, net of reversals			(2)
Costs Not Affecting Restructuring Liability			(5)
Cash Paid			(168)
Other			7
Restructuring Liability, ending balance	160		160
Costs reversed			3
Acquired Liabilities | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			256
Costs Expensed, net of reversals			1
Costs Not Affecting Restructuring Liability			(2)
Cash Paid			(139)
Other			6
Restructuring Liability, ending balance	122		122
Acquired Liabilities | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			72
Costs Expensed, net of reversals			(3)
Costs Not Affecting Restructuring Liability			(3)
Cash Paid			(29)
Other			1
Restructuring Liability, ending balance	$ 38		$ 38