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Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 2,232 | $ 3,074 | $ 5,089 | $ 5,207
Accounts and notes receivable | 5,597 | 5,173 |  |
Inventories | 3,993 | 3,477 |  |
Prepaid expenses and other current assets | 821 | 532 |  |
Total Current Assets | 12,643 | 12,256 |  |
Investments and long-term receivables | 12,936 | 12,143 |  |
Net properties, plants and equipment | 20,247 | 19,721 |  |
Goodwill | 3,275 | 3,275 |  |
Intangibles | 896 | 906 |  |
Other assets | 364 | 279 |  |
Total Assets | 50,361 | 48,580 |  |
Liabilities and Equity |  |  |  |
Accounts payable | 7,084 | 5,655 |  |
Short-term debt | 1,532 | 44 |  |
Accrued income and other taxes | 912 | 878 |  |
Employee benefit obligations | 385 | 576 |  |
Other accruals | 487 | 378 |  |
Total Current Liabilities | 10,400 | 7,531 |  |
Long-term debt | 7,330 | 8,843 |  |
Asset retirement obligations and accrued environmental costs | 672 | 665 |  |
Deferred income taxes | 6,233 | 6,041 |  |
Employee benefit obligations | 1,343 | 1,285 |  |
Other liabilities and deferred credits | 317 | 277 |  |
Total Liabilities | 26,295 | 24,642 |  |
Common stock | 10,997 | 11,405 |  |
Retained earnings | 12,597 | 12,348 |  |
Accumulated other comprehensive income (loss) | (752) | (653) | (469) | (531)
Noncontrolling interests | 1,224 | 838 |  |
Total Liabilities and Equity | 50,361 | 48,580 |  |
Phillips 66 [Member] |  |  |  |
Assets |  |  |  |
Accounts and notes receivable | 13 | 14 |  |
Prepaid expenses and other current assets | 1 | 2 |  |
Total Current Assets | 14 | 16 |  |
Investments and long-term receivables | 31,691 | 33,315 |  |
Other assets | 12 | 16 |  |
Total Assets | 31,717 | 33,347 |  |
Liabilities and Equity |  |  |  |
Short-term debt | 1,498 |  |  |
Other accruals | 59 | 59 |  |
Total Current Liabilities | 1,557 | 59 |  |
Long-term debt | 5,917 | 7,413 |  |
Other liabilities and deferred credits | 1,372 | 2,746 |  |
Total Liabilities | 8,846 | 10,218 |  |
Common stock | 10,997 | 11,405 |  |
Retained earnings | 12,626 | 12,377 |  |
Accumulated other comprehensive income (loss) | (752) | (653) |  |
Total Liabilities and Equity | 31,717 | 33,347 |  |
Phillips 66 Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 864 | 575 | 1,595 | 2,045
Accounts and notes receivable | 3,614 | 3,643 |  |
Inventories | 2,657 | 2,171 |  |
Prepaid expenses and other current assets | 488 | 382 |  |
Total Current Assets | 7,623 | 6,771 |  |
Investments and long-term receivables | 22,722 | 24,068 |  |
Net properties, plants and equipment | 12,867 | 12,651 |  |
Goodwill | 3,040 | 3,040 |  |
Intangibles | 722 | 726 |  |
Other assets | 205 | 154 |  |
Total Assets | 47,179 | 47,410 |  |
Liabilities and Equity |  |  |  |
Accounts payable | 5,333 | 4,015 |  |
Short-term debt | 28 | 25 |  |
Accrued income and other taxes | 378 | 320 |  |
Employee benefit obligations | 347 | 528 |  |
Other accruals | 339 | 240 |  |
Total Current Liabilities | 6,425 | 5,128 |  |
Long-term debt | 146 | 158 |  |
Asset retirement obligations and accrued environmental costs | 499 | 496 |  |
Deferred income taxes | 4,420 | 4,500 |  |
Employee benefit obligations | 1,146 | 1,094 |  |
Other liabilities and deferred credits | 2,895 | 2,765 |  |
Total Liabilities | 15,531 | 14,141 |  |
Common stock | 25,403 | 25,404 |  |
Retained earnings | 6,997 | 8,518 |  |
Accumulated other comprehensive income (loss) | (752) | (653) |  |
Total Liabilities and Equity | 47,179 | 47,410 |  |
All Other Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 1,368 | 2,499 | $ 3,494 | $ 3,162
Accounts and notes receivable | 3,334 | 2,217 |  |
Inventories | 1,336 | 1,306 |  |
Prepaid expenses and other current assets | 332 | 148 |  |
Total Current Assets | 6,370 | 6,170 |  |
Investments and long-term receivables | 7,775 | 7,395 |  |
Net properties, plants and equipment | 7,380 | 7,070 |  |
Goodwill | 235 | 235 |  |
Intangibles | 174 | 180 |  |
Other assets | 149 | 113 |  |
Total Assets | 22,083 | 21,163 |  |
Liabilities and Equity |  |  |  |
Accounts payable | 3,115 | 2,341 |  |
Short-term debt | 6 | 19 |  |
Accrued income and other taxes | 534 | 558 |  |
Employee benefit obligations | 38 | 48 |  |
Other accruals | 89 | 79 |  |
Total Current Liabilities | 3,782 | 3,045 |  |
Long-term debt | 1,267 | 1,272 |  |
Asset retirement obligations and accrued environmental costs | 173 | 169 |  |
Deferred income taxes | 1,815 | 1,545 |  |
Employee benefit obligations | 197 | 191 |  |
Other liabilities and deferred credits | 3,705 | 3,734 |  |
Total Liabilities | 10,939 | 9,956 |  |
Common stock | 10,782 | 10,688 |  |
Retained earnings | (624) | (200) |  |
Accumulated other comprehensive income (loss) | (238) | (119) |  |
Noncontrolling interests | 1,224 | 838 |  |
Total Liabilities and Equity | 22,083 | 21,163 |  |
Consolidating Adjustments [Member] |  |  |  |
Assets |  |  |  |
Accounts and notes receivable | (1,364) | (701) |  |
Total Current Assets | (1,364) | (701) |  |
Investments and long-term receivables | (49,252) | (52,635) |  |
Other assets | (2) | (4) |  |
Total Assets | (50,618) | (53,340) |  |
Liabilities and Equity |  |  |  |
Accounts payable | (1,364) | (701) |  |
Total Current Liabilities | (1,364) | (701) |  |
Deferred income taxes | (2) | (4) |  |
Other liabilities and deferred credits | (7,655) | (8,968) |  |
Total Liabilities | (9,021) | (9,673) |  |
Common stock | (36,185) | (36,092) |  |
Retained earnings | (6,402) | (8,347) |  |
Accumulated other comprehensive income (loss) | 990 | 772 |  |
Total Liabilities and Equity | $ (50,618) | $ (53,340) |  |

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