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Note 6 - Investment in Unconsolidated Affiliates Uintah Basin Field Services, LLC (“UBFS”) and Three Rivers Gathering (“TRG”), LLC Joint Ventures Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Equity Method Investments |  |  |
Investment in unconsolidated affiliates | $ 58 | $ 57 | [1]
UBFS |  |  |
Equity Method Investments |  |  |
Ownership interest | 38.00% |  |
Investment in unconsolidated affiliates |  | 18 |
Equity method investment, difference between carrying amount and underlying equity | $ 8 |  |
TRG |  |  |
Equity Method Investments |  |  |
Ownership interest | 50.00% |  |
Investment in unconsolidated affiliates | $ 41 | $ 39 |
Equity method investment, difference between carrying amount and underlying equity | $ 17 |  |
[1] | Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.

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