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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 |
Mar. 31, 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 | $ 1,055 | $ 918 |
| Short term marketable securities | 682 | 543 |
| Available-for-sale securities | 1,466 | 1,497 |
| Debt | 2,365 | 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 | 1,055 | 918 |
| Short term marketable securities | 95 | 62 |
| Available-for-sale securities | 1,037 | 1,047 |
| Debt | 0 | 0 |
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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] | ||
| Cash equivalents | 0 | 0 |
| Short term marketable securities | 587 | 481 |
| Available-for-sale securities | 429 | 450 |
| Debt | $ 2,365 | $ 2,355 |