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Acquisitions and Divestitures Asset Purchase and Subsequent Sale of Noncontrolling Interest (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 15, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 28, 2017
Property, Plant and Equipment [Line Items]          
Proceeds from noncontrolling interests   $ 12 $ 117 $ 11  
Elba Liquification Company LLC [Member]          
Property, Plant and Equipment [Line Items]          
Payments to Acquire Assets, Investing Activities $ 185        
Shell US Gas & Power LLC [Member] | Elba Liquification Company LLC [Member]          
Property, Plant and Equipment [Line Items]          
Equity Method Investment, Ownership Percentage 49.00%        
Capacity Subscribed, Percent 100.00%        
Sale of Equity Interest in Elba Liquification Company LLC [Member] [Member]          
Property, Plant and Equipment [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         49.00%
Controlling Interest, Ownership Percentage by Parent         51.00%
Other Long-Term Liabilities and Deferred Credits [Member] | Sale of Equity Interest in Elba Liquification Company LLC [Member] [Member]          
Property, Plant and Equipment [Line Items]          
Proceeds from noncontrolling interests   $ 386