Commitments And Contingencies (Narrative) (Details) (USD $) In Billions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Commitments related to streaming content license agreements	$ 3.68	$ 3.91

The minimum amount the entity agreed to spend under the long-term purchase commitment.

No definition available.

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration