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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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