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Redeemable Noncontrolling Interest (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Apr. 30, 2018
Jun. 30, 2020
Dec. 31, 2019
[1]
Redeemable noncontrolling interests   $ 750 $ 739
Preferred Stock, Redemption Price Per Share   $ 807  
USAC [Member]      
Redeemable noncontrolling interests   $ 477  
ETO [Member]      
Redeemable noncontrolling interests   15  
SemCAMS [Member]      
Redeemable noncontrolling interests   $ 258  
Preferred Stock, Shares Outstanding   329,830  
Preferred Units [Member] | USAC [Member]      
Preferred Units, Issued   500,000  
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 24.375    
Canada, Dollars      
Preferred Stock, Redemption Price Per Share   $ 1,100  
[1]
*As adjusted. See Note 1.