Commitments And Contingencies (Minimum Contractual Obligations) (Details) (USD $) In Millions, unless otherwise specified														1 Months Ended	9 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2012 Developer/Licensor Commitments	Dec. 31, 2012 Marketing	Dec. 31, 2012 Leases	Dec. 31, 2012 Convertible Notes Interest		Dec. 31, 2012 Other Unrecorded Purchase Obligations	Dec. 31, 2012 0.75% Convertible Senior Notes Due 2016		Dec. 31, 2012 Other Recorded Purchase Obligations		Jul. 14, 2011 0.75% Convertible Senior Notes Due 2016	Jul. 31, 2011 0.75% Convertible Senior Notes Due 2016	Dec. 31, 2012 0.75% Convertible Senior Notes Due 2016	Jul. 14, 2011 0.75% Convertible Senior Notes Due 2016
Long Term Purchase Commitments
Unrecorded Portion for 2013 (remaining three months)	$ 85		$ 42	$ 14	$ 13	$ 2	[1]	$ 14
Unrecorded Portion for 2014	307		174	54	51	5	[1]	23
Unrecorded Portion for 2015	256		166	34	42	5	[1]	9
Unrecorded Portion for 2016	275		207	34	28	5	[1]	1
Unrecorded Portion for 2017	108		70	20	16	2	[1]	0
Unrecorded Portion for 2018	85		54	20	11	0	[1]	0
Unrecorded Portion for Thereafter	532		453	63	16	0	[1]	0
Unrecorded Total	1,648		1,166	239	177	19	[1]	47
Recorded Portion for 2013 (remaining three months)	9								0	[1]	9	[2]
Recorded Portion for 2014	28								0	[1]	28	[2]
Recorded Portion for 2015	20								0	[1]	20	[2]
Recorded Portion for 2016	5								0	[1]	5	[2]
Recorded Portion for 2017	653								633	[1]	20	[2]
Recorded Portion for 2018	1								0	[1]	1	[2]
Recorded Portion for Thereafter	1								0	[1]	1	[2]
Recorded Total	717								633	[1]	84	[2]
Total for 2013 (remaining three months)	94
Total for 2014	335
Total for 2015	276
Total for 2016	280
Total for 2017	761
Total for 2018	86
Total for Thereafter	533
Total Commitments	2,365
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	5
Principal amount	632.5	632.5											632.5
Debt Instrument, Unamortized Discount						79
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	0.75%	0.75%													0.75%	0.75%
Convertible Senior Notes due description														2016	2016
Other Accrued Liabilities, Current	$ 332	$ 441				$ 2

[1] Included in the $19 million coupon interest on the 0.75% Convertible Senior Notes due 2016 is $2 million of accrued interest recognized as of December 31, 2012. 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 $79 million of unamortized discount of the liability component. See Note 12 for additional information regarding our 0.75% Convertible Senior Notes due 2016.

[2] (b)See Note 8 for additional information regarding recognized commitments resulting from our restructuring plans. Lease commitments have not been reduced for approximately $5 million due in the future from third parties under non-cancelable sub-leases.