Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES
Net income	$ 967	$ 1,156	$ 875
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	172	197	220
Stock-based compensation	196	178	144
Loss on Conversion of Convertible Notes	0	10	0
Acquisition-related contingent consideration	0	0	(3)
Change in assets and liabilities:
Receivables, net	(136)	127	(54)
Other assets	3	22	106
Accounts payable	5	13	(46)
Accrued and other liabilities	(5)	(252)	31
Deferred income taxes, net	100	(403)	1
Deferred net revenue (online-enabled games)	81	175	(207)
Net cash provided by operating activities	1,383	1,223	1,067
INVESTING ACTIVITIES
Capital expenditures	(123)	(93)	(95)
Proceeds from maturities and sales of short-term investments	1,281	941	727
Purchase of short-term investments	(1,917)	(1,332)	(1,102)
Net cash used in investing activities	(759)	(484)	(470)
FINANCING ACTIVITIES
Proceeds from issuance of senior notes, net of issuance costs	0	989	0
Payment of convertible notes	(163)	(470)	0
Proceeds from issuance of common stock	72	107	60
Excess tax benefit from stock-based compensation	65	86	22
Repurchase and retirement of common stock	(508)	(1,018)	(337)
Net cash used in financing activities	(534)	(306)	(255)
Effect of foreign exchange on cash and cash equivalents	(18)	(8)	(56)
Increase in cash and cash equivalents	72	425	286
Beginning cash and cash equivalents	2,493	2,068	1,782
Ending cash and cash equivalents	2,565	2,493	2,068
Supplemental cash flow information:
Cash paid during the year for income taxes, net	51	35	2
Cash paid during the year for interest	$ 43	$ 4	$ 6