Commitments And Contingencies (Minimum Contractual Obligations) (Details) (USD $) In Millions, unless otherwise specified													1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Developer/Licensor Commitments [Member]	Mar. 31, 2013 Marketing [Member]	Mar. 31, 2013 Leases [Member]	Mar. 31, 2013 Convertible Notes Interest [Member]		Mar. 31, 2013 Other Unrecognized Purchase Obligations [Member]	Mar. 31, 2013 0.75% Convertible Senior Notes Due 2016 [Member]		Mar. 31, 2013 Other Recognized Purchase Obligations [Member]		Jul. 31, 2011 0.75% Convertible Senior Notes Due 2016 [Member]	Mar. 31, 2012 0.75% Convertible Senior Notes Due 2016 [Member]	Jul. 14, 2011 0.75% Convertible Senior Notes Due 2016 [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecognized commitments for 2014	$ 278		$ 158	$ 37	$ 50	$ 5	[1]	$ 28
Unrecognized commitments for 2015	283		178	47	44	5	[1]	9
Unrecognized commitments for 2016	302		228	35	32	5	[1]	2
Unrecoginzed commitments for 2017	108		69	20	17	2	[1]	0
Unrecogized commitments for 2018	86		53	20	13	0	[1]	0
Unrecogized commitments thereafter	540		458	64	18	0	[1]	0
Total unrecognized commitments	1,597		1,144	223	174	17	[1]	39
Recognized commitments for 2014	25								0	[1]	25	[2]
Recognized commitments for 2015	18								0	[1]	18	[2]
Recognized commitments for 2016	6								0	[1]	6	[2]
Recognized commitments for 2017	653								633	[1]	20	[2]
Recognized commitments for 2018	1								0	[1]	1	[2]
Recognized commitments thereafter	1								0	[1]	1	[2]
Total recognized commitments	704								633	[1]	71	[2]
Total commitments for 2014	303
Total commitments for 2015	301
Total commitments for 2016	308
Total commitments for 2017	761
Total commitments for 2018	87
Total commitments thereafter	541
Total commitments	2,301
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	0.75%	0.75%												0.75%	0.75%
Other accrued expenses	338	441				1
Principal amount	632.5	632.5													632.5
0.75% Convertible Senior Notes due 2016 maturity date													Jul. 15, 2016
Unamortized discount of the liability component	(74)	(94)
Amount that would reduce lease commitments due to minimum sub-lease rentals for unutilized office space resulting from reorganization activities due in the future under non-cancelable sub-leases	$ 6

[1] Included in the $17 million coupon interest on the 0.75% Convertible Senior Notes due 2016 is $1 million of accrued interest recognized as of March 31, 2013. We will be obligated to pay the $632.5 million principal amount of the 0.75% Convertible Senior Notes due 2016 in cash and any excess conversion value in shares of our common stock upon redemption of the Notes at maturity on July 15, 2016 or upon earlier redemption. The $632.5 million principal amount excludes $74 million of unamortized discount of the liability component. See Note 11 for additional information regarding our 0.75% Convertible Senior Notes due 2016.

[2] See Note 7 for additional information regarding recognized commitments resulting from our restructuring plans. Lease commitments have not been reduced for approximately $6 million due in the future from third parties under non-cancelable sub-leases.