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Acquisitions and Dispositions - Acquisitions (Details) $ in Millions		12 Months Ended
	Feb. 14, 2017 USD ($) mile market_interconnect	Dec. 31, 2016 USD ($) acquisition	Dec. 31, 2015 USD ($) acquisition	Dec. 31, 2014 USD ($) acquisition
Acquisitions
Cash consideration		$ 282	$ 105	$ 1,098
Goodwill recognized			11
Individually immaterial business acquisitions
Acquisitions
Cash consideration		$ 289	$ 105	$ 1,099
Number of acquisitions completed | acquisition		2	3	3
Goodwill recognized		$ 0	$ 11	$ 1
Integrated System Of NGL Assets
Acquisitions
Cash consideration		$ 204
Subsequent Event | Alpha Holding Company, LLC
Acquisitions
Equity interests acquired	100.00%
Cash consideration	$ 1,215
Length of gathering and transmission lines | mile	515
Number of market interconnects | market_interconnect	5
Bridge Tex Pipeline Company LLC
Acquisitions
Interest acquired				50.00%
Frontier Aspen, LLC
Acquisitions
Interest acquired			28.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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-Name Accounting Standards Codification
-Topic 350
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