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Financial Instruments - Schedule of fair value associated with derivative financial instruments (Details) (Level 2, USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Derivative Assets | ||
| Gross Fair Value | $ 1,069 | $ 1,093 |
| Impact of Netting | (34) | (44) |
| Derivative Liabilities | ||
| Gross Fair Value | (35) | (45) |
| Impact of Netting | 34 | 44 |
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Current assets
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| Derivative Assets | ||
| Derivatives instruments | 746 | 752 |
|
Non-current assets
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||
| Derivative Assets | ||
| Derivatives instruments | 289 | 297 |
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Current liabilities
|
||
| Derivative Liabilities | ||
| Derivatives instruments | (1) | (1) |
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Non-current liabilities
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| Derivative Liabilities | ||
| Derivatives instruments | $ 0 | $ 0 |