Quarterly Financial and Market Information (Unaudited) (Details) (USD $) In Millions, except Per Share data	3 Months Ended																12 Months Ended
	Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010		Mar. 31, 2010		Dec. 31, 2009		Sep. 30, 2009		Jun. 30, 2009		Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Net revenue	$ 1,090		$ 1,053		$ 631		$ 815		$ 979		$ 1,243		$ 788		$ 644		$ 3,589	$ 3,654	$ 4,212
Gross profit	762		467		268		593		681		589		195		323		2,090	1,788	2,085
Operating income (loss)	145		(303)		(252)		98		83		(107)		(417)		(245)		(312)	(686)	(827)
Net income (loss)	151	[1]	(322)	[2]	(201)	[3]	96	[4]	30	[5]	(82)	[6]	(391)	[7]	(234)	[8]	(276)	(677)	(1,088)
Net income (loss) per share - Basic and Diluted	$ 0.45		$ (0.97)		$ (0.61)		$ 0.29		$ 0.09		$ (0.25)		$ (1.21)		$ (0.72)		$ (0.84)	$ (2.08)	$ (3.4)
High price, common stock per share	$ 20.20		$ 18.06		$ 17.53		$ 20.24		$ 18.99		$ 21.05		$ 22.14		$ 23.76		$ 20.24	$ 23.76
Low price, common stock per share	$ 14.80		$ 14.67		$ 14.32		$ 14.06		$ 15.70		$ 15.86		$ 17.68		$ 17.48		$ 14.06	$ 15.70
(Gains) losses on strategic investments, net					(28)		5		1		1		8		16		(23)	26	62
Restructuring and other charges	(1)		154														161	140	80
Restructuring charges					6		2		20		100		6		14
Loss on lease obligation													14
Gain on licensed intellectual property commitment					(1)				(1)				(2)
Contingent Consideration [Member]
Acquisition-related contingent consideration	$ 8		$ 1		$ (28)		$ 2		$ 2

[1] 1) million, both of which are pre-tax amounts.

[2] Net loss includes restructuring and other charges of $154 million and acquisition-related contingent consideration of $1 million, both of which are pre-tax amounts.

[3] Net loss includes restructuring charges of $6 million, $(1) million on licensed intellectual property commitment (COGS), a $(28) million gain on strategic investments, net, and $(28) million of acquisition-related contingent consideration, all of which are pre-tax amounts.

[4] Net income includes losses on strategic investments of $5 million, $2 million of acquisition-related contingent consideration, and restructuring charges of $2 million, all of which are pre-tax amounts.

[5] Net income includes restructuring charges of $20 million, $2 million of acquisition-related contingent consideration, $(1) million on licensed intellectual property commitment (COGS), and a $1 million loss on strategic investments, all of which are pre-tax amounts.

[6] Net loss includes restructuring charges of $100 million and losses on strategic investments of $1 million, both of which are pre-tax amounts.

[7] Net loss includes a loss on lease obligation (G&A) of $14 million, losses on strategic investments of $8 million, restructuring charges of $6 million, and $(2) million on licensed intellectual property commitment (COGS), all of which are pre-tax amounts.

[8] Net loss includes losses on strategic investments of $16 million and restructuring charges of $14 million, both of which are pre-tax amounts.