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Phillips 66 Partners LP (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 10, 2016 | Jun. 30, 2016 | May 31, 2016 | Mar. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Issuance of Phillips 66 Partners LP common units |  |  |  |  |  | $ 562 | $ 384 |
Net properties, plants and equipment |  | $ 20,247 |  |  | $ 20,247 | 20,247 |  | $ 19,721
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Issuance of Phillips 66 Partners LP common units |  |  |  |  |  | $ 381 | $ 384 |
Phillips 66 Partners LP [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Limited partner interest in Phillips 66 Partners owned by public, percentage |  |  |  |  |  | 37.00% |  |
Phillips 66 Partners LP [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Limited partnership interest in Phillips 66 Partners, percentage |  |  |  |  |  | 61.00% |  |
General partnership interest in Phillips 66 Partners, percentage |  |  |  |  |  | 2.00% |  |
Equity investments |  | 1,008 |  |  | 1,008 | $ 1,008 |  |
Net properties, plants and equipment |  | 1,673 |  |  | $ 1,673 | $ 1,673 |  |
Phillips 66 Partners LP [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Entities under common control, ownership percentage transferred |  |  |  | 25.00% |  |  |  |
Total consideration for contributed assets |  |  |  | $ 236 |  |  |  |
Note payable to us |  |  |  | 212 |  |  |  |
Entities under common control, ownership percentage transferred, wholly owned |  |  | 100.00% |  |  |  |  |
Phillips 66 Partners LP [Member] | Common And General Partner Units [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Aggregate fair value of units received |  |  |  | $ 24 |  |  |  |
Phillips 66 Partners LP [Member] | Phillips 66 Sweeny Frac LLC [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Entities under common control, ownership percentage transferred |  |  | 75.00% |  |  |  |  |
Phillips 66 Partners LP [Member] | Sweeny Frac LLC And Phillips 66 Plymouth LLC [Member] [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Note payable to us |  |  | $ 675 |  |  |  |  |
Phillips 66 Partners LP [Member] | Sweeny Frac LLC And Phillips 66 Plymouth LLC [Member] [Member] | Common And General Partner Units [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Aggregate fair value of units received |  |  | 100 |  |  |  |  |
Majority Shareholder [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Total consideration for contributed assets |  |  | $ 775 |  |  |  |  |
Common Units [Member] | Phillips 66 Partners LP [Member] |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Units, sold in public offering, shares | 12,650,000 |  |  |  |  |  |  |
Sale of stock, price per share (in usd per share) | $ 52.40 |  |  |  |  |  |  |
Public sale of units net of offering costs | $ 656 |  |  |  |  |  |  |
Partners' capital account, units, amount authorized |  | $ 250 |  |  |  |  |  |
Partners' capital account, units, sale of units |  |  |  |  | 262,858 |  |  |
Issuance of Phillips 66 Partners LP common units |  |  |  |  | $ 14 |  |  |

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