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Fair Value Measurements (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Liabilities: |  |
Carrying value of debt, net of unamortized discount | $ 10,400 | $ 9,900
Total Fair Value |  |
Liabilities: |  |
Debt estimated fair value | 10,400 | 10,400
Recurring | Level 2 | Accrued liabilities |  |
Liabilities: |  |
Embedded derivatives | 17 | 39
Recurring | Level 2 | Deferred credits and other liabilities |  |
Liabilities: |  |
Embedded derivatives | 86 | 147
Recurring | Total Fair Value | Accrued liabilities |  |
Liabilities: |  |
Embedded derivatives | 17 | 39
Recurring | Total Fair Value | Deferred credits and other liabilities |  |
Liabilities: |  |
Embedded derivatives | 86 | 147
Non recurring | Proved gas and oil properties |  |
Liabilities: |  |
Pre-tax impairment charges | $ 42 | $ 397

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