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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 |  |  |

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