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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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