Restructuring Costs - Restructuring Liability (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			$ 270
Costs Expensed, Net of Reversals	$ 36	$ 104	248	$ 441
Costs Not Affecting Restructuring Liability			(46)
Cash Paid			(279)
Other			(6)
Restructuring Liability, ending balance	187		187
Fiscal 2022 Plan
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			0
Costs Expensed, Net of Reversals			246
Costs Not Affecting Restructuring Liability			(40)
Cash Paid			(111)
Other			(1)
Restructuring Liability, ending balance	94		94
Fiscal 2022 Plan | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			0
Costs Expensed, Net of Reversals			181
Costs Not Affecting Restructuring Liability			2
Cash Paid			(91)
Other			(3)
Restructuring Liability, ending balance	89		89
Fiscal 2022 Plan | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			0
Costs Expensed, Net of Reversals			65
Costs Not Affecting Restructuring Liability			(42)
Cash Paid			(20)
Other			2
Restructuring Liability, ending balance	5		5
Fiscal 2021 Plan
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			183
Costs Expensed, Net of Reversals			6
Costs Not Affecting Restructuring Liability			(6)
Cash Paid			(128)
Other			(3)
Restructuring Liability, ending balance	52		52
Fiscal 2021 Plan | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			180
Costs Expensed, Net of Reversals			0
Costs Not Affecting Restructuring Liability			0
Cash Paid			(127)
Other			(2)
Restructuring Liability, ending balance	51		51
Fiscal 2021 Plan | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			3
Costs Expensed, Net of Reversals			6
Costs Not Affecting Restructuring Liability			(6)
Cash Paid			(1)
Other			(1)
Restructuring Liability, ending balance	1		1
Fiscal 2020 Plan
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			27
Costs Expensed, Net of Reversals			(1)
Costs Not Affecting Restructuring Liability			0
Cash Paid			(14)
Other			(1)
Restructuring Liability, ending balance	11		11
Fiscal 2020 Plan | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			27
Costs Expensed, Net of Reversals			(1)
Costs Not Affecting Restructuring Liability			0
Cash Paid			(14)
Other			(1)
Restructuring Liability, ending balance	11		11
Fiscal 2020 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
Other Prior Year Plans
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			25
Costs Expensed, Net of Reversals			1
Costs Not Affecting Restructuring Liability			0
Cash Paid			(19)
Other			1
Restructuring Liability, ending balance	8		8
Other Prior Year Plans | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			19
Costs Expensed, Net of Reversals			1
Costs Not Affecting Restructuring Liability			0
Cash Paid			(15)
Other			1
Restructuring Liability, ending balance	6		6
Other Prior Year Plans | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			6
Costs Expensed, Net of Reversals			0
Costs Not Affecting Restructuring Liability			0
Cash Paid			(4)
Other			0
Restructuring Liability, ending balance	2		2
Acquired Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			35
Costs Expensed, Net of Reversals			(4)
Costs Not Affecting Restructuring Liability			0
Cash Paid			(7)
Other			(2)
Restructuring Liability, ending balance	22		22
Acquired Liabilities | Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			34
Costs Expensed, Net of Reversals			(4)
Costs Not Affecting Restructuring Liability			0
Cash Paid			(6)
Other			(2)
Restructuring Liability, ending balance	22		22
Acquired Liabilities | Facilities Costs
Restructuring Reserve [Roll Forward]
Restructuring Liability, beginning balance			1
Costs Expensed, Net of Reversals			0
Costs Not Affecting Restructuring Liability			0
Cash Paid			(1)
Other			0
Restructuring Liability, ending balance	$ 0		$ 0