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Equity - AOCI Reclassifications Table (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |
Oil, natural gas and NGL reserves, reclassifications from AOCI | $ 993 | $ 1,543
Total reclassification from AOCI | (921) | (3,720)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total reclassification from AOCI | 4 | 10
Commodity Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Oil, natural gas and NGL reserves, reclassifications from AOCI | $ 4 | $ 10

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