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Segment Disclosures and Related Information (Summary of Sales and Other Operating Revenues, Net Income (Loss) Attributable to Phillips 66 and Total Assets by Operating Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues | [1] | $ 21,849 | $ 28,512 | $ 39,258 | $ 51,290 |
Net Income (Loss) Attributable to Phillips 66 |  | 496 | 1,012 | 881 | 1,999 |
Analysis of results of assets by operating segment |  |  |  |  |  |
Total Assets |  | 50,361 |  | 50,361 |  | $ 48,580
Midstream [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | 641 | 670 | 1,280 | 1,385 |
Net Income (Loss) Attributable to Phillips 66 |  | 39 | (78) | 104 | (11) |
Analysis of results of assets by operating segment |  |  |  |  |  |
Total Assets |  | 11,896 |  | 11,896 |  | 11,043
Chemicals [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | 1 | 1 | 2 | 3 |
Net Income (Loss) Attributable to Phillips 66 |  | 190 | 295 | 346 | 498 |
Analysis of results of assets by operating segment |  |  |  |  |  |
Total Assets |  | 5,644 |  | 5,644 |  | 5,237
Refining [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | 4,293 | 7,035 | 7,972 | 12,550 |
Net Income (Loss) Attributable to Phillips 66 |  | 149 | 604 | 235 | 1,142 |
Analysis of results of assets by operating segment |  |  |  |  |  |
Total Assets |  | 23,214 |  | 23,214 |  | 21,993
Marketing and Specialties [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | 16,906 | 20,794 | 29,988 | 37,331 |
Net Income (Loss) Attributable to Phillips 66 |  | 229 | 314 | 434 | 618 |
Analysis of results of assets by operating segment |  |  |  |  |  |
Total Assets |  | 6,397 |  | 6,397 |  | 5,631
Corporate and Other [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | 8 | 12 | 16 | 21 |
Net Income (Loss) Attributable to Phillips 66 |  | (111) | (123) | (238) | (248) |
Analysis of results of assets by operating segment |  |  |  |  |  |
Total Assets |  | 3,210 |  | 3,210 |  | $ 4,676
Operating Segments [Member] | Midstream [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | 919 | 913 | 1,850 | 1,882 |
Operating Segments [Member] | Refining [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | 13,539 | 18,955 | 23,777 | 33,226 |
Operating Segments [Member] | Marketing and Specialties [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | 17,180 | 21,343 | 30,528 | 38,091 |
Intersegment Eliminations [Member] | Midstream [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | (278) | (243) | (570) | (497) |
Intersegment Eliminations [Member] | Refining [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | (9,246) | (11,920) | (15,805) | (20,676) |
Intersegment Eliminations [Member] | Marketing and Specialties [Member] |  |  |  |  |  |
Analysis of results by operating segment |  |  |  |  |  |
Sales and other operating revenues |  | $ (274) | $ (549) | $ (540) | $ (760) |
[1] | Includes excise taxes on petroleum products sales:

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