Quarterly report pursuant to Section 13 or 15(d)

Investments In Affiliates Accounted For Using The Equity Method (SIRIUS XM Consolidated Balance Sheets) (Details)

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Investments In Affiliates Accounted For Using The Equity Method (SIRIUS XM Consolidated Balance Sheets) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
SIRIUS XM [Member]
Dec. 31, 2010
SIRIUS XM [Member]
Current assets $ 3,380 $ 3,914 $ 1,277 $ 992
Property and equipment, net 209 215 1,674 1,761
Intangible assets     2,574 2,633
Goodwill     1,835 1,835
Other assets 223 238 136 162
Total assets 7,122 7,723 7,496 7,383
Current liabilities 547 1,230 2,248 2,350
Deferred income taxes 427 411 1,011 915
Long-term debt 540 541 2,684 2,696
Other Liabilities, Noncurrent 287 290 849 1,214
Noncontrolling interests in equity of subsidiaries (6) (10)    
Equity 5,321 5,251 704 208
Total liabilities and equity $ 7,122 $ 7,723 $ 7,496 $ 7,383