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Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Cash equivalents | $ 1,462 | $ 762 |
| Short term marketable securities | 667 | 412 |
| Available-for-sale securities | 1,157 | 1,309 |
| Debt | 2,474 | 2,355 |
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Fair Value, Inputs, Level 1 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Cash equivalents | 1,462 | 762 |
| Short term marketable securities | 161 | 62 |
| Available-for-sale securities | 1,127 | 1,047 |
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Significant Other Observable Inputs (Level 2)
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Short term marketable securities | 506 | 350 |
| Available-for-sale securities | 30 | 262 |
| Debt | $ 2,474 | $ 2,355 |