| Pay vs Performance Disclosure | 6 Months Ended | 12 Months Ended |
| Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) |
| Pay vs Performance Disclosure [Table] | | | | | |
| Pay vs Performance [Table Text Block] | | | Year Summary Compensation Table Total for First PEO 1 ($) Summary Compensation Table Total for Second PEO 1 ($) Compensation Actually Paid to First PEO 2 $) Compensation Actually Paid to Second PEO 2 ($) Average Summary Compensation Table Total for Non-PEO NEOs 3 ($) Average Compensation Actually Paid to Non-PEO NEOs 2,3 ($) Value of Initial Fixed $100 Investment Based On: GAAP Net Income ($ MM) Annual Adjusted PSP ROCE 5 (%) Total Shareholder Return 4 ($) Peer Group Total Shareholder Return 4 ($) (a) (b) (b) (c) (c) (d) (e) (f) (g) (h) (i) 2022 18,229,917 16,288,870 36,488,607 24,349,594 7,564,734 12,019,418 108.84 140.02 11,391 24.5 2021 20,953,206 — 21,535,633 — 8,163,303 7,817,258 72.45 106.53 1,594 8.5 2020 24,989,374 — 2,700,837 — 6,290,976 2,618,978 66.45 78.79 (3,714) 0.8 | | |
| Company Selected Measure Name | | | Adjusted PSP ROCE | | |
| Named Executive Officers, Footnote [Text Block] | | | The first Principal Executive Officer (PEO) reflected in column (b) refers to Mr. Garland, Chairman and Chief Executive Officer until June 30, 2022 and Executive Chairman beginning July 1, 2022. The second Principal Executive Officer (PEO) reflected in column (b) refers to Mr. Lashier, President and Chief Operating Officer until June 30, 2022, and President and Chief Executive Officer beginning July 1, 2022.The Non-PEO NEOs reflected in columns (d) and (e) represent the following individuals: For 2022, Mr. Mitchell, Ms. Allen Sutherland, Mr. Mandell, and Mr. Roberts; for 2021, Mr. Lashier, Mr. Mitchell, Mr. Roberts, and Mr. Herman; and for 2020, Mr. Mitchell, Mr. Roberts, Mr. Herman, and Ms. Johnson. | | |
| Peer Group Issuers, Footnote [Text Block] | | | The Peer Group TSR in column (g) represents the weighted average market capitalization of our peer group used for purposes of Item 201(e) of Regulation S-K, which are: Delek US Holdings, Inc.; HF Sinclair Corporation; Marathon Petroleum Corporation; PBF Energy Inc.; Valero Energy Corporation; CVR Energy Inc.; Dow Inc.; Westlake Chemical Corporation; LyondellBasell Industries N.V; ONEOK, Inc.; Targa Resources Corp.; and The Williams Companies, Inc. | | |
| Adjustment To PEO Compensation, Footnote [Text Block] | | | To calculate CAP, the following adjustments were made to Summary Compensation Table total compensation, in accordance with SEC rules: Compensation Actually Paid to PEO 2022 2022 2021 2020 Summary Compensation Table Total 18,229,917 16,288,870 20,953,206 24,989,374 Less, value of “Stock Awards” and “Option Awards” reported in Summary Compensation Table (12,326,210) (11,236,523) (14,459,165) (12,588,803) Less, Change in Pension Value reported in Summary Compensation Table — (231,983) — (6,851,884) Plus, year-end fair value of outstanding and unvested equity awards granted in the year 15,794,483 14,260,576 14,662,552 9,514,060 Plus, fair value as of vesting date of equity awards granted and vested in the year (a) 89,225 59,342 114,921 85,470 Plus (less), year over year change in fair value of outstanding and unvested equity awards granted in prior years 9,650,492 4,073,013 470,710 (6,371,181) Plus (less), year over year change in fair value of equity awards granted in prior years that vested in the year 3,803,161 910,182 (1,835,338) (7,136,027) Plus, the value of dividends or other earnings paid on equity awards in the year 398,405 178,639 394,928 357,826 Plus, pension service cost for services rendered during the year 849,133 47,478 1,233,818 702,002 Compensation Actually Paid to PEO 36,488,607 24,349,594 21,535,633 2,700,837 | | |
| Non-PEO NEO Average Total Compensation Amount | | | $ 7,564,734 | $ 8,163,303 | $ 6,290,976 |
| Non-PEO NEO Average Compensation Actually Paid Amount | | | $ 12,019,418 | 7,817,258 | 2,618,978 |
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | | | Average Compensation Actually Paid to Non-PEO NEOs 2022 2021 2020 Summary Compensation Table Total 7,564,734 8,163,303 6,290,976 Less, value of “Stock Awards” and “Option Awards” reported in Summary Compensation Table (5,081,089) (5,575,650) (3,332,826) Less, Change in Pension Value reported in Summary Compensation Table (84,081) (196,955) (765,023) Plus, year-end fair value of outstanding and unvested equity awards granted in the year 6,388,526 5,407,971 2,531,727 Plus, fair value as of vesting date of equity awards granted and vested in the year (a) 26,925 38,733 16,332 Plus (less), year over year change in fair value of outstanding and unvested equity awards granted in prior years 2,188,370 102,802 (1,578,875) Plus (less), year over year change in fair value of equity awards granted in prior years that vested in the year 735,558 (359,892) (821,489) Plus, the value of dividends or other earnings paid on equity awards in the year 135,895 150,681 133,668 Plus, pension service cost for services rendered during the year 144,581 86,265 144,488 Compensation Actually Paid to Non-PEO NEOs 12,019,418 7,817,258 2,618,978 | | |
| Compensation Actually Paid vs. Total Shareholder Return [Text Block] | | | CAP versus Total Shareholder Return The chart below shows the alignment between the PEO and other NEOs’ CAP amounts and the Company’s TSR. This is primarily due to the Company’s use of equity incentives, which are tied directly to stock price performance and the Company’s financial performance. | | |
| Compensation Actually Paid vs. Net Income [Text Block] | | | CAP versus Net Income (Loss) As shown in the chart below, the Company’s net income has significantly increased since 2020 primarily as a result of improved market conditions and strong operating results. In 2020, the pandemic challenged our operational and financial environment and we reported a net loss of approximately $3.7 billion. In 2021 and 2022, we realized strong performance and reported net income of approximately $1.6 billion and $11.4 billion, respectively. The recovery has positively impacted our stock price and therefore the PEO and other NEOs’ CAP amounts increased in 2021 and 2022 as equity incentives are sensitive to changes in stock price. | | |
| Compensation Actually Paid vs. Company Selected Measure [Text Block] | | | CAP versus Annual Adjusted PSP ROCE The chart below shows the correlation between annual non-GAAP Adjusted PSP ROCE and CAP. Because CAP values both vested and outstanding equity using either the value of the award as of the vesting date or the change in value of the award with respect to the prior year end, we consider annual Adjusted PSP ROCE a better measure to show the correlation of company performance to CAP rather than the three-year performance period average non-GAAP Adjusted PSP ROCE we use to determine final payout of our PSP. | | |
| Tabular List [Table Text Block] | | | Most Important Performance Measures • Adjusted EBITDA • Adjusted Controllable Costs • Adjusted PSP ROCE • 3-Year Relative TSR | | |
| Total Shareholder Return Amount | | | $ 108.84 | 72.45 | 66.45 |
| Peer Group Total Shareholder Return Amount | | | 140.02 | 106.53 | 78.79 |
| Net Income (Loss) | | | $ 11,391,000,000 | $ 1,594,000,000 | $ (3,714,000,000) |
| Company Selected Measure Amount | | | 24.5 | 8.5 | 0.8 |
| PEO Name | Mr. Lashier | Mr. Garland | | Mr. Garland | Mr. Garland |
| Additional 402(v) Disclosure [Text Block] | | | The charts that follow depict the relationship of "compensation actually paid" (CAP) to our PEOs and other NEOs to (i) the TSR of the Company and its peer group (as described in Footnote 4 above), (ii) the Company's net income, and (iii) the Company's annual non-GAAP Adjusted PSP ROCE. Pursuant to Item 402(v) of Regulation S-K, CAP reflects adjustments to the fair value of equity awards during the years presented. Changes in our stock price and the projected and actual achievement of our performance goals greatly impact the total CAP reported for each year presented. For example, our annual TSR performance of -37%, 3%, and 44% for 2020, 2021, and 2022, respectively, contributed to significant changes in CAP values reported for each year. | | |
| Measure [Axis]: 1 | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Measure Name | | | •Adjusted PSP ROCE | | |
| Non-GAAP Measure Description [Text Block] | | | See Appendix B for a reconciliation of Adjusted PSP ROCE to the nearest GAAP financial measure. | | |
| Measure [Axis]: 2 | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Measure Name | | | •Adjusted EBITDA | | |
| Measure [Axis]: 3 | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Measure Name | | | •Adjusted Controllable Costs | | |
| Measure [Axis]: 4 | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Measure Name | | | •3-Year Relative TSR | | |
| Garland [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| PEO Total Compensation Amount | | | $ 18,229,917 | $ 20,953,206 | $ 24,989,374 |
| PEO Actually Paid Compensation Amount | | | 36,488,607 | 21,535,633 | 2,700,837 |
| Lashier [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| PEO Total Compensation Amount | | | 16,288,870 | | |
| PEO Actually Paid Compensation Amount | | | 24,349,594 | | |
| PEO [Member] | Garland [Member] | Value Of Stock Awards And Option Awards [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | (12,326,210) | (14,459,165) | (12,588,803) |
| PEO [Member] | Garland [Member] | Change In Pension Value [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 0 | 0 | (6,851,884) |
| PEO [Member] | Garland [Member] | Fair Value Of Outstanding And Unvested Equity Awards Granted In The Year [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 15,794,483 | 14,662,552 | 9,514,060 |
| PEO [Member] | Garland [Member] | Fair Value As Of Vesting Date Of Equity Awards Granted And Vested In The Year [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 89,225 | 114,921 | 85,470 |
| PEO [Member] | Garland [Member] | Change In Fair Value Of Outstanding And Unvested Equity Awards Granted In Prior Years [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 9,650,492 | 470,710 | (6,371,181) |
| PEO [Member] | Garland [Member] | Change In Fair Value Of Equity Awards Granted In Prior Years That Vested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 3,803,161 | (1,835,338) | (7,136,027) |
| PEO [Member] | Garland [Member] | Value Of Dividends Or Other Earnings Paid On Equity Awards [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 398,405 | 394,928 | 357,826 |
| PEO [Member] | Garland [Member] | Pension Service Cost For Services Rendered During The Year [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 849,133 | 1,233,818 | 702,002 |
| PEO [Member] | Lashier [Member] | Value Of Stock Awards And Option Awards [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | (11,236,523) | | |
| PEO [Member] | Lashier [Member] | Change In Pension Value [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | (231,983) | | |
| PEO [Member] | Lashier [Member] | Fair Value Of Outstanding And Unvested Equity Awards Granted In The Year [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 14,260,576 | | |
| PEO [Member] | Lashier [Member] | Fair Value As Of Vesting Date Of Equity Awards Granted And Vested In The Year [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 59,342 | | |
| PEO [Member] | Lashier [Member] | Change In Fair Value Of Outstanding And Unvested Equity Awards Granted In Prior Years [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 4,073,013 | | |
| PEO [Member] | Lashier [Member] | Change In Fair Value Of Equity Awards Granted In Prior Years That Vested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 910,182 | | |
| PEO [Member] | Lashier [Member] | Value Of Dividends Or Other Earnings Paid On Equity Awards [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 178,639 | | |
| PEO [Member] | Lashier [Member] | Pension Service Cost For Services Rendered During The Year [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 47,478 | | |
| Non-PEO NEO [Member] | Value Of Stock Awards And Option Awards [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | (5,081,089) | (5,575,650) | (3,332,826) |
| Non-PEO NEO [Member] | Change In Pension Value [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | (84,081) | (196,955) | (765,023) |
| Non-PEO NEO [Member] | Fair Value Of Outstanding And Unvested Equity Awards Granted In The Year [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 6,388,526 | 5,407,971 | 2,531,727 |
| Non-PEO NEO [Member] | Fair Value As Of Vesting Date Of Equity Awards Granted And Vested In The Year [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 26,925 | 38,733 | 16,332 |
| Non-PEO NEO [Member] | Change In Fair Value Of Outstanding And Unvested Equity Awards Granted In Prior Years [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 2,188,370 | 102,802 | (1,578,875) |
| Non-PEO NEO [Member] | Change In Fair Value Of Equity Awards Granted In Prior Years That Vested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 735,558 | (359,892) | (821,489) |
| Non-PEO NEO [Member] | Value Of Dividends Or Other Earnings Paid On Equity Awards [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | 135,895 | 150,681 | 133,668 |
| Non-PEO NEO [Member] | Pension Service Cost For Services Rendered During The Year [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | | $ 144,581 | $ 86,265 | $ 144,488 |
