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Fair Value Measurements (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |  |
Derivatives | $ 7 | $ 22 |
Derivatives | 184 | $ 124 |
Recurring Basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |  |
Marketable Securities | 58 |  | $ 9
Derivatives | 7 |  | 22
Total Assets at Fair Value | 65 |  | 31
Derivatives | 184 |  | 124
Total Liabilities at Fair Value | 184 |  | 124
Recurring Basis | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |  |
Marketable Securities | 58 |  | 9
Derivatives | 1 |  | 0
Total Assets at Fair Value | 59 |  | 9
Derivatives | 117 |  | 78
Total Liabilities at Fair Value | 117 |  | 78
Recurring Basis | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |  |
Marketable Securities | 0 |  | 0
Derivatives | 6 |  | 22
Total Assets at Fair Value | 6 |  | 22
Derivatives | 67 |  | 46
Total Liabilities at Fair Value | 67 |  | 46
Recurring Basis | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |  |
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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