Restructuring, Separation, and Transition, and Other Costs (Details) $ in Millions	12 Months Ended
	Mar. 31, 2017 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 33
Costs, Net of Adjustments	189
Cash Payments	(141)
Non-Cash Charges	(35)
Ending balance	46
Fiscal 2017 Plan:
Restructuring Reserve [Roll Forward]
Beginning balance	4
Costs, Net of Adjustments	174
Cash Payments	(106)
Non-Cash Charges	(30)
Ending balance	42
Fiscal 2017 Plan Cumulative Incurred to Date	178
Fiscal 2017 Plan: | Severance costs
Restructuring Reserve [Roll Forward]
Beginning balance	0
Costs, Net of Adjustments	76
Cash Payments	(56)
Non-Cash Charges	0
Ending balance	20
Fiscal 2017 Plan Cumulative Incurred to Date	76
Fiscal 2017 Plan: | Other exit and disposal costs
Restructuring Reserve [Roll Forward]
Beginning balance	4
Costs, Net of Adjustments	75
Cash Payments	(50)
Non-Cash Charges	(7)
Ending balance	22
Fiscal 2017 Plan Cumulative Incurred to Date	79
Fiscal 2017 Plan: | Asset write-offs
Restructuring Reserve [Roll Forward]
Beginning balance	0
Costs, Net of Adjustments	23
Cash Payments	0
Non-Cash Charges	(23)
Ending balance	0
Fiscal 2017 Plan Cumulative Incurred to Date	23
Fiscal 2017 Plan: | Restructuring and Separation Costs
Restructuring Reserve [Roll Forward]
Costs, Net of Adjustments	10
Prior year plans
Restructuring Reserve [Roll Forward]
Beginning balance	29
Costs, Net of Adjustments	15
Cash Payments	(35)
Non-Cash Charges	(5)
Ending balance	4
Continuing Operations
Restructuring Cost and Reserve [Line Items]
Restructuring, separation, transition, and other	94
Minimum | Fiscal 2017 Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	415
Minimum | Fiscal 2017 Plan: | Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	185
Minimum | Fiscal 2017 Plan: | Other exit and disposal costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	190
Maximum | Fiscal 2017 Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	465
Maximum | Fiscal 2017 Plan: | Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	195
Maximum | Fiscal 2017 Plan: | Other exit and disposal costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 215