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Summary of Significant Accounting Policies - Cost Classifications (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Reclassified gain (loss) on derivatives, net | $ 146 | $ (70) | $ (19)
Cost of Materials and other | Commodity Derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Reclassified gain (loss) on derivatives, net | $ 146 | $ (70) | $ (20)

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