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Redeemable Noncontrolling Interest (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Apr. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Apr. 02, 2018
Redeemable noncontrolling interests   $ 499 $ 499  
USAC [Member]        
Redeemable noncontrolling interests   477    
ETO [Member]        
Redeemable noncontrolling interests   $ 22    
Preferred Units [Member] | USAC [Member]        
Preferred Units, Issued       500,000
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 24.375      
Shares Issued, Price Per Share       $ 1,000
Proceeds from Issuance of Preferred Limited Partners Units $ 500