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Long-Term Debt Private Offering of Senior Notes (Details) - Subsequent Event [Member] - USD ($) | Feb. 07, 2018 | Jan. 25, 2018 | Jan. 23, 2018
--- | --- | --- | ---
Series A Preferred Unit, Redemption Amount |  | $ 313,000,000 |
Common Unit Repurchase, Unit Repurchased | 17,286,859 |  |
Stated interest rate |  |  | 5.875%
Common Unit Repurchase, Cash Consideration | $ 540,000,000 |  |
Senior Notes [Member] |  |  |
Debt face amount |  |  | $ 2,200,000,000.0
Four Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Three [Member] | Senior Notes [Member] |  |  |
Debt face amount |  |  | $ 1,000,000,000.0
Stated interest rate |  |  | 4.875%
Five Point Five Zero Zero Percentage Senior Notes Due Two Thousand Twenty Six [Member] | Senior Notes [Member] |  |  |
Debt face amount |  |  | $ 800,000,000
Stated interest rate |  |  | 5.50%
Five Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Eight [Member] | Senior Notes [Member] |  |  |
Debt face amount |  |  | $ 400,000,000

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