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Redeemable Noncontrolling Interest (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Mar. 31, 2019
Jan. 31, 2019
Apr. 30, 2018
Dec. 31, 2018
Apr. 02, 2018
Proceeds from Issuance of Senior Long-term Debt   $ 3,960      
Redeemable noncontrolling interests $ 499     $ 499  
USAC [Member]          
Redeemable noncontrolling interests 477        
ETO [Member]          
Proceeds from Issuance of Senior Long-term Debt 4,210        
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    
9.7% Senior Notes, due March 15, 2019 [Member] | ETO [Member]          
Repayments of Senior Debt   $ 400      
Debt Instrument, Interest Rate, Stated Percentage   9.70%      
9.0% Senior Notes due April 15, 2019 [Member] | ETO [Member]          
Repayments of Senior Debt   $ 450      
Debt Instrument, Interest Rate, Stated Percentage   9.00%      
8.125% Senior Notes, due June 1, 2019 [Member] | Panhandle [Member]          
Repayments of Senior Debt   $ 150      
Debt Instrument, Interest Rate, Stated Percentage   8.125%