Commitments and Contingencies (Minimum Contractual Obligations) (Details) (USD $) In Millions	Mar. 31, 2011
2012	$ 473
2013	275
2014	219
2015	169
2016	131
Thereafter	470
Total	1,737
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	12
Leases [Member]
2012	44	[1]
2013	36	[1]
2014	26	[1]
2015	21	[1]
2016	15	[1]
Thereafter	9	[1]
Total	151	[1]
Developer and Licensor Commitments [Member]
2012	331
2013	199
2014	124
2015	114
2016	83
Thereafter	366
Total	1,217
Marketing [Member]
2012	90
2013	37
2014	66
2015	32
2016	33
Thereafter	95
Total	353
Other Purchase Obligations [Member]
2012	8
2013	3
2014	3
2015	2
Total	$ 16

[1] Lease commitments have not been reduced by minimum sub-lease rentals for unutilized office space resulting from our reorganization activities of approximately $12 million due in the future under non-cancelable sub-leases.