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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