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Commitments and Contingencies Commitments and Contingencies (Purchase Obligations Narrative) (Details) (USD $)
In Billions, unless otherwise specified |
9 Months Ended |
|---|---|
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Sep. 30, 2014
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| Commitments and Contingencies Disclosure [Abstract] | |
| Unrecorded unconditional purchase obligations | $ 3.4 |
| Term of unrecorded unconditional purchase obligations | 2036 |