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Redeemable Preferred Units (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2019
Jan. 31, 2021
Dec. 31, 2018
Apr. 02, 2018
Redeemable noncontrolling interests   $ 739   $ 499  
USAC [Member]          
Redeemable noncontrolling interests   477      
ETO [Member]          
Redeemable noncontrolling interests   15      
SemCAMS [Member]          
Redeemable noncontrolling interests   $ 247      
Preferred Stock, Shares Outstanding   300,000      
Preferred Units [Member] | USAC [Member]          
Preferred Units, Issued         500,000
Shares Issued, Price Per Share         $ 1,000
Proceeds from Issuance of Preferred Limited Partners Units $ 500        
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 24.375        
Preferred Stock, Redemption Terms   In addition, at any time on or after the tenth anniversary of the issue date, the holders of the USAC Preferred Units will have the right to require USAC to redeem all or any portion of the USAC Preferred Units, and the Partnership may elect to pay up to 50% of such redemption amount in USAC common units.      
Preferred Units [Member] | SemCAMS [Member]          
Preferred Units, Issued   315,859      
Subsequent Event [Member]          
Preferred Stock, Redemption Price Per Share     $ 845    
Canada, Dollars | Subsequent Event [Member]          
Preferred Stock, Redemption Price Per Share     $ 1,100