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Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis and Subject to Fair Value Disclosure Requirements) (Details) (USD $)
In Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
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Jun. 30, 2011
|
Dec. 31, 2010
|
|
| Money market funds | $ 251 | $ 534 |
| Fair value gain (loss) on foreign exchange currency contracts | 0 | 0 |
|
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
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| Money market funds | 251 | 534 |
|
Significant Other Observable Inputs (Level 2) [Member]
|
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| Money market funds | 0 | 0 |
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Significant Unobservable Inputs (Level 3) [Member]
|
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| Money market funds | $ 0 | $ 0 |