Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES
Net income (loss)	$ 8	$ 98	$ 76
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion	227	264	216
Stock-based compensation	150	164	170
Acquisition-related contingent consideration	(35)	(64)	11
Net (gains) losses on investments and disposal of property and equipment	2	(37)	(12)
Non-cash restructuring charges	0	7	(6)
Change in assets and liabilities:
Receivables, net	(12)	56	(14)
Inventories	(13)	16	21
Other assets	(56)	15	(101)
Accounts payable	(18)	(78)	(50)
Accrued and other liabilities	(3)	(106)	13
Deferred income taxes, net	16	(7)	(90)
Deferred net revenue (online-enabled games)	446	(4)	(43)
Net cash provided by operating activities	712	324	277
INVESTING ACTIVITIES
Capital expenditures	(97)	(106)	(172)
Proceeds from sale of property and equipment	0	0	26
Proceeds from sale of marketable equity securities	0	72	0
Proceeds from maturities and sales of short-term investments	401	459	526
Purchase of short-term investments	(600)	(414)	(468)
Acquisition-related restricted cash	0	31	75
Acquisition of subsidiaries, net of cash acquired	(5)	(10)	(676)
Net cash provided by (used in) investing activities	(301)	32	(689)
FINANCING ACTIVITIES
Proceeds from issuance of common stock	77	34	57
Proceeds from borrowings on convertible senior notes, net of issuance costs	0	0	617
Proceeds from issuance of warrants	0	0	65
Purchase of convertible note hedge	0	0	(107)
Payments of debt issuance costs	0	(2)	0
Excess tax benefit from stock-based compensation	13	0	4
Repurchase and retirement of common stock	0	(349)	(471)
Acquisition-related contingent consideration payment	(1)	(28)	(25)
Net cash provided by (used in) financing activities	89	(345)	140
Effect of foreign exchange on cash and cash equivalents	(10)	(12)	(14)
Increase (decrease) in cash and cash equivalents	490	(1)	(286)
Beginning cash and cash equivalents	1,292	1,293	1,579
Ending cash and cash equivalents	1,782	1,292	1,293
Supplemental cash flow information:
Cash paid (refunded) during the year for income taxes, net	29	26	(4)
Cash paid during the year for interest	6	5	2
Non-cash investing activities:
Change in unrealized gains and losses on available-for-sale securities, net of taxes	0	(46)	(40)
Equity issued in connection with acquisition	$ 0	$ 0	$ 87