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Acquisitions (Purchase Price Allocation - Gas Storage and Pipelines Segment Acquisition) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Dec. 04, 2019
Assets      
Goodwill $ 2,465 $ 2,464  
Gas Storage and Pipelines | Blue Union and LEAP      
Assets      
Cash     $ 62
Accounts receivable     31
Property, plant, and equipment, net     1,035
Goodwill $ 172   172
Other current assets     1
Total assets     2,774
Liabilities      
Accounts payable     26
Acquisition related deferred payment     380
Other current liabilities     2
Asset retirement obligations     9
Total liabilities     417
Total cash consideration     2,357
Gas Storage and Pipelines | Customer relationships | Blue Union and LEAP      
Assets      
Customer relationship intangibles     $ 1,473