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Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets and Liabilities Measured at Fair Value on a Recurring Basis |  |
Derivatives | $ 10 | $ 32
Derivatives | 147 | 109
Recurring Basis |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis |  |
Marketable Securities | 13 | 13
Derivatives | 10 | 32
Total Assets at Fair Value | 23 | 45
Derivatives | 147 | 109
Total Liabilities at Fair Value | 147 | 109
Recurring Basis | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis |  |
Marketable Securities | 13 | 13
Derivatives | 1 | 15
Total Assets at Fair Value | 14 | 28
Derivatives | 130 | 78
Total Liabilities at Fair Value | 130 | 78
Recurring Basis | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis |  |
Marketable Securities | 0 | 0
Derivatives | 9 | 17
Total Assets at Fair Value | 9 | 17
Derivatives | 17 | 31
Total Liabilities at Fair Value | 17 | 31
Recurring Basis | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis |  |
Marketable Securities | 0 | 0
Derivatives | 0 | 0
Total Assets at Fair Value | 0 | 0
Derivatives | 0 | 0
Total Liabilities at Fair Value | $ 0 | $ 0

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