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Debt (SMR Transaction) (Details) - USD ($) $ in Millions | Sep. 01, 2009 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, net |  | $ 14,639 | $ 12,187
Accrued liabilities |  | 250 | 231
Deferred credits and other liabilities |  | 197 | 188
Steam Methane Reformer Held Under Financing Arrangement [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Proceeds from liability | $ 73 |  |
Imputed interest rate on liability | 6.39% |  |
Property, plant and equipment, net |  | 51 | 56
Accrued liabilities |  | 5 | 5
Deferred credits and other liabilities |  | $ 81 | $ 86

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