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Redeemable Preferred Units (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Apr. 30, 2018
Jan. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Apr. 02, 2018
Redeemable noncontrolling interests     $ 762 $ 739  
USAC [Member]          
Redeemable noncontrolling interests     477    
ETO [Member]          
Redeemable noncontrolling interests     15    
SemCAMS [Member]          
Redeemable noncontrolling interests     $ 270    
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 Units [Member] | SemCAMS [Member]          
Preferred Units, Issued     344,419    
Subsequent Event [Member]          
Preferred Stock, Redemption Price Per Share   $ 864      
Canada, Dollars | Subsequent Event [Member]          
Preferred Stock, Redemption Price Per Share   $ 1,100