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Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] |  |  |  |
Net Cash Provided by Operating Activities |  | $ 1,413 | $ 2,779 |
Cash Flows From Investing Activities |  |  |  |
Capital expenditures and investments | [1] | (1,370) | (2,294) |
Proceeds from asset dispositions | [2] | 15 | (5) | [3]
Advances/loans—related parties |  | (182) | (50) |
Collection of advances/loans—related parties |  |  | 50 |
Other |  | (75) | 47 |
Net Cash Used in Investing Activities |  | (1,612) | (2,252) |
Cash Flows From Financing Activities |  |  |  |
Issuance of debt |  | 150 | 1,169 |
Repayment of debt |  | (166) | (904) |
Issuance of common stock |  | (29) | (25) |
Repurchase of common stock |  | (633) | (733) |
Dividends paid on common stock |  | (625) | (574) |
Distributions to noncontrolling interests |  | (28) | (20) |
Net proceeds from issuance of Phillips 66 Partners LP common units |  | 669 | 384 |
Other | [1] | 11 | 2 |
Net Cash Used in Financing Activities |  | (651) | (701) |
Effect of Exchange Rate Changes on Cash and Cash Equivalents |  | 8 | 56 |
Net Change in Cash and Cash Equivalents |  | (842) | (118) |
Cash and cash equivalents at beginning of period |  | 3,074 | 5,207 |
Cash and Cash Equivalents at End of Period |  | 2,232 | 5,089 |
Phillips 66 [Member] |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] |  |  |  |
Net Cash Provided by Operating Activities |  | 2,486 | 531 |
Cash Flows From Investing Activities |  |  |  |
Intercompany lending activities |  | (1,190) | 1,611 |
Net Cash Used in Investing Activities |  | (1,190) | 1,611 |
Cash Flows From Financing Activities |  |  |  |
Repayment of debt |  |  | (800) |
Issuance of common stock |  | (29) | (25) |
Repurchase of common stock |  | (633) | (733) |
Dividends paid on common stock |  | (625) | (574) |
Other | [1] | (9) | (10) |
Net Cash Used in Financing Activities |  | (1,296) | (2,142) |
Phillips 66 Company [Member] |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] |  |  |  |
Net Cash Provided by Operating Activities |  | 1,259 | 1,386 |
Cash Flows From Investing Activities |  |  |  |
Capital expenditures and investments | [1] | (685) | (663) |
Proceeds from asset dispositions |  | 3 | 773 | [3]
Intercompany lending activities |  | 2,295 | (1,357) |
Advances/loans—related parties |  | (75) | (50) |
Collection of advances/loans—related parties |  |  | 50 |
Other |  | 13 | (28) |
Net Cash Used in Investing Activities |  | 1,551 | (1,275) |
Cash Flows From Financing Activities |  |  |  |
Repayment of debt |  | (11) | (9) |
Dividends paid on common stock |  | (2,528) | (574) |
Other | [1] | 18 | 22 |
Net Cash Used in Financing Activities |  | (2,521) | (561) |
Net Change in Cash and Cash Equivalents |  | 289 | (450) |
Cash and cash equivalents at beginning of period |  | 575 | 2,045 |
Cash and Cash Equivalents at End of Period |  | 864 | 1,595 |
All Other Subsidiaries [Member] |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] |  |  |  |
Net Cash Provided by Operating Activities |  | 876 | 1,524 |
Cash Flows From Investing Activities |  |  |  |
Capital expenditures and investments | [1] | (723) | (2,465) |
Proceeds from asset dispositions |  | 12 | 104 | [3]
Intercompany lending activities |  | (1,105) | (254) |
Advances/loans—related parties |  | (107) |  |
Collection of advances/loans—related parties |  |  | 0 |
Other |  | (88) | 75 |
Net Cash Used in Investing Activities |  | (2,011) | (2,540) |
Cash Flows From Financing Activities |  |  |  |
Issuance of debt |  | 150 | 1,169 |
Repayment of debt |  | (155) | (95) |
Dividends paid on common stock |  | (680) | (48) |
Distributions to controlling interests |  |  | (186) |
Distributions to noncontrolling interests |  | (28) | (20) |
Net proceeds from issuance of Phillips 66 Partners LP common units |  | 669 | 384 |
Other | [1] | 40 | 88 |
Net Cash Used in Financing Activities |  | (4) | 1,292 |
Effect of Exchange Rate Changes on Cash and Cash Equivalents |  | 8 | 56 |
Net Change in Cash and Cash Equivalents |  | (1,131) | 332 |
Cash and cash equivalents at beginning of period |  | 2,499 | 3,162 |
Cash and Cash Equivalents at End of Period |  | 1,368 | 3,494 |
Consolidating Adjustments [Member] |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] |  |  |  |
Net Cash Provided by Operating Activities |  | (3,208) | (662) |
Cash Flows From Investing Activities |  |  |  |
Capital expenditures and investments | [1] | 38 | 834 |
Proceeds from asset dispositions | [3] |  | (882) |
Net Cash Used in Investing Activities |  | 38 | (48) |
Cash Flows From Financing Activities |  |  |  |
Dividends paid on common stock |  | 3,208 | 622 |
Distributions to controlling interests |  |  | 186 |
Other | [1] | (38) | (98) |
Net Cash Used in Financing Activities |  | $ 3,170 | $ 710 |
[1] | Includes intercompany capital contributions.
[2] | Includes return of investments in equity affiliates and working capital true-ups on dispositions.
[3] | Includes return of investments in equity affiliates and working capital true-ups on dispositions

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