Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2012		Sep. 30, 2011
OPERATING ACTIVITIES
Net Loss	$ (180)		$ (119)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, amortization and accretion, net	112		94
Stock-based compensation	83		81
Acquisition-related contingent consideration	(20)		19
Non-cash restructuring charges	7		0
Net gains on investments and sale of property and equipment	0		(12)
Change in assets and liabilities:
Receivables, net	(274)		(215)
Inventories	(13)		(11)
Other assets	0		(63)
Accounts payable	9		(57)
Accrued and other liabilities	109		2
Deferred income taxes, net	(10)		(48)
Deferred net revenue (packaged goods and digital content)	(95)		(156)
Net cash used in operating activities	(272)		(485)
INVESTING ACTIVITIES
Capital expenditures	(56)		(84)
Proceeds from sale of property and equipment	0		26
Proceeds from maturities and sales of short-term investments	280		319
Purchase of short-term investments	(197)		(179)
Acquisition-related restricted cash	25		0
Acquisition of subsidiaries, net of cash acquired	(10)		(657)
Net cash provided by (used in) investing activities	42		(575)
FINANCING ACTIVITIES
Proceeds from issuance of common stock	18		35
Proceeds from borrowings on convertible senior notes, net of issuance costs	0		617
Proceeds from issuance of warrants	0		65
Purchase of convertible note hedge	0		(107)
Payment of debt issuance costs	(2)		0
Excess tax benefit from stock-based compensation	0		3
Repurchase and retirement of common stock	179		189
Acquisition-related contingent consideration payment	(26)		0
Net cash provided by (used in) financing activities	(189)		424
Effect of foreign exchange on cash and cash equivalents	(3)		(13)
Decrease in cash and cash equivalents	(422)		(649)
Beginning cash and cash equivalents	1,293	[1]	1,579
Ending cash and cash equivalents	871		930
Supplemental cash flow information:
Cash paid (refunded) during the period for income taxes, net	17		(9)
Cash paid during the period for interest	2		0
Non-cash investing activities:
Change in unrealized gains on available-for-sale securities, net of taxes	(25)		55
Equity issued in connection with acquisition	$ 0		$ 87

[1] Derived from audited consolidated financial statements.