v2.4.0.6

Fair Value Measurements (Schedule Of Changes In Level 3 Fair Value Measurements) (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2009 | Dec. 31, 2011 | Dec. 31, 2011 Long-Term Investments [Member] | Dec. 31, 2010 Long-Term Investments [Member] | Dec. 31, 2011 Debt [Member] | Dec. 31, 2010 Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long-term investments balance at beginning of period |  | $ 94 | $ 94 | $ 115 |  |
Redemptions of principal |  |  | (10) | (21) |  |
Long-term investments balance at end of period |  | 84 | 84 | 94 |  |
Debt balance at beginning of period |  |  |  |  | (144) |
Issuance of promissory note | 139 |  |  |  |  | (139)
Foreign exchange translation adjustment |  |  |  |  | 1 | (9)
Accretion of promissory note |  |  |  |  | (5) | (3)
Redemptions of principal |  |  |  |  | 63 | 7
Debt balance at end of period |  |  |  |  | $ (85) | $ (144)
Interest rate used to estimate the fair value of debt |  | 3.125% |  |  |  |

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