Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
Mar. 31, 2012 SS/L Credit Agreement [Member]	Mar. 31, 2012 Letter Of Credit Sublimit [Member] Maximum [Member]	Mar. 31, 2012 Swingline Commitment [Member]	Mar. 31, 2012 Prior Credit Agreement [Member]	Dec. 08, 2011 Credit Agreement Before Amended [Member] Letter Of Credit Sublimit [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	$ 150	$ 100	$ 10	$ 100	$ 50
Maturity date	Jan. 24, 2014
Line of credit facility, initiation date				October 16, 2008
Line of credit facility, expiration date				October 16, 2011

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant