Cash, Cash Equivalents and Investments - Components of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	May 31, 2020	Feb. 29, 2020
Cash and Cash Equivalents [Line Items]
Cost Basis	$ 963	$ 998
Unrealized Gains	0	0
Unrealized Losses	8	(8)
Other-than- temporary Impairment	0	0
Fair Value	955	990
Cash and Cash Equivalents	312	377
Short-term Investments	562	532
Long-term investments (note 3)	33	32
Restricted cash and cash equivalents	48	49
Bank balances
Cash and Cash Equivalents [Line Items]
Cost Basis	120	100
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	120	100
Cash and Cash Equivalents	120	100
Short-term Investments	0	0
Long-term investments (note 3)	0	0
Restricted cash and cash equivalents (note 3)	0	0
Other investments
Cash and Cash Equivalents [Line Items]
Cost Basis	33	32
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	33	32
Cash and Cash Equivalents	0	0
Short-term Investments	0	0
Long-term investments (note 3)	33	32
Restricted cash and cash equivalents (note 3)	0	0
Bank Balances and Other Investments [Domain]
Cash and Cash Equivalents [Line Items]
Cost Basis	153	132
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	153	132
Cash and Cash Equivalents	120	100
Short-term Investments	0	0
Long-term investments (note 3)	33	32
Restricted cash and cash equivalents (note 3)	0	0
Level 1: | Equity securities
Cash and Cash Equivalents [Line Items]
Cost Basis	10	10
Unrealized Gains	0	0
Unrealized Losses	(8)	(8)
Other-than- temporary Impairment	0	0
Fair Value	2	2
Cash and Cash Equivalents	0	0
Short-term Investments	2	2
Long-term investments (note 3)	0	0
Restricted cash and cash equivalents (note 3)	0	0
Level 2:
Cash and Cash Equivalents [Line Items]
Cost Basis	800	856
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	800	856
Cash and Cash Equivalents	192	277
Short-term Investments	560	530
Long-term investments (note 3)	0	0
Restricted cash and cash equivalents (note 3)	48	49
Level 2: | Corporate notes/bonds
Cash and Cash Equivalents [Line Items]
Cost Basis	37
Unrealized Gains	0
Unrealized Losses	0
Other-than- temporary Impairment	0
Fair Value	37
Cash and Cash Equivalents	37
Short-term Investments	0
Long-term investments (note 3)	0
Restricted cash and cash equivalents (note 3)	0
Level 2: | Term deposits, certificates of deposits, and GICs
Cash and Cash Equivalents [Line Items]
Cost Basis	108	118
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	108	118
Cash and Cash Equivalents	10	44
Short-term Investments	50	25
Long-term investments (note 3)	0	0
Restricted cash and cash equivalents (note 3)	48	49
Level 2: | Bearer deposit notes
Cash and Cash Equivalents [Line Items]
Cost Basis	131	84
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	131	84
Cash and Cash Equivalents	79	30
Short-term Investments	52	54
Long-term investments (note 3)	0	0
Restricted cash and cash equivalents (note 3)	0	0
Level 2: | Commercial paper
Cash and Cash Equivalents [Line Items]
Cost Basis	289	276
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	289	276
Cash and Cash Equivalents	62	108
Short-term Investments	227	168
Long-term investments (note 3)	0	0
Restricted cash and cash equivalents (note 3)	0	0
Level 2: | Non-U.S. promissory notes
Cash and Cash Equivalents [Line Items]
Cost Basis	172	133
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	172	133
Cash and Cash Equivalents	4	25
Short-term Investments	168	108
Long-term investments (note 3)	0	0
Restricted cash and cash equivalents (note 3)	0	0
Level 2: | Non-U.S. government sponsored enterprise notes
Cash and Cash Equivalents [Line Items]
Cost Basis	38	144
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	38	144
Cash and Cash Equivalents	0	0
Short-term Investments	38	144
Long-term investments (note 3)	0	0
Restricted cash and cash equivalents (note 3)	0	0
Level 2: | Non-U.S. treasury bills/notes
Cash and Cash Equivalents [Line Items]
Cost Basis	25	56
Unrealized Gains	0	0
Unrealized Losses	0	0
Other-than- temporary Impairment	0	0
Fair Value	25	56
Cash and Cash Equivalents	0	25
Short-term Investments	25	31
Long-term investments (note 3)	0	0
Restricted cash and cash equivalents (note 3)	$ 0	0
Level 2: | U.S. treasury bills/notes
Cash and Cash Equivalents [Line Items]
Cost Basis		45
Unrealized Gains		0
Unrealized Losses		0
Other-than- temporary Impairment		0
Fair Value		45
Cash and Cash Equivalents		45
Short-term Investments		0
Long-term investments (note 3)		0
Restricted cash and cash equivalents (note 3)		$ 0