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Acquisitions (Purchase Price Allocation - Gas Storage and Pipelines Segment Acquisition) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 04, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets        
Goodwill $ 2,464   $ 2,293 $ 2,293
Gas Storage and Pipelines | Blue Union and LEAP        
Assets        
Cash   $ 62    
Accounts receivable   31    
Property, plant, and equipment, net   1,035    
Goodwill   171    
Other current assets   1    
Total assets   2,773    
Liabilities        
Accounts payable   26    
Acquisition related deferred payment   378    
Other current liabilities   2    
Asset retirement obligations   9    
Total liabilities   415    
Total cash consideration   2,358    
Gas Storage and Pipelines | Customer relationships | Blue Union and LEAP        
Assets        
Customer relationship intangibles   $ 1,473