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SHARE BASED COMPENSATION - Share Unit Plans - (Details) $ / shares in Units, shares in Thousands, EquityInstruments in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2022 CAD ($) EquityInstruments $ / shares | Dec. 31, 2021 EquityInstruments shares | Dec. 31, 2020 EquityInstruments shares
SHARE BASED COMPENSATION |  |  |
Vesting period |  | 3 years |
Performance Share Units (PSUs) |  |  |
SHARE BASED COMPENSATION |  |  |
Vesting period |  | 3 years |
Outstanding, beginning of year | 2,766 | 2,285 | 2,193
Granted |  | 1,285 | 1,232
Redeemed for cash | shares |  | (751) | (1,086)
Forfeited/expired | shares |  | (53) | (54)
Outstanding, end of year |  | 2,766 | 2,285
Performance Share Units (PSUs) | Minimum |  |  |
SHARE BASED COMPENSATION |  |  |
Percentage of share price receivable at the time of vesting |  | 0.00% |
Performance Share Units (PSUs) | Maximum |  |  |
SHARE BASED COMPENSATION |  |  |
Percentage of share price receivable at the time of vesting |  | 200.00% |
Restricted Stock Units (RSUs) |  |  |
SHARE BASED COMPENSATION |  |  |
Vesting period |  | 3 years |
Outstanding, beginning of year | 21,437 | 15,095 | 13,602
Granted |  | 11,954 | 6,567
Redeemed for cash | shares |  | (4,609) | (4,707)
Forfeited/expired | shares |  | (1,003) | (367)
Outstanding, end of year |  | 21,437 | 15,095
Deferred Share Units (DSUs) |  |  |
SHARE BASED COMPENSATION |  |  |
Outstanding, beginning of year | 1,382 | 1,385 | 1,287
Granted |  | 164 | 289
Redeemed for cash | shares |  | (167) | (191)
Outstanding, end of year |  | 1,382 | 1,385
Deferred Share Units (DSUs) | Director |  |  |
SHARE BASED COMPENSATION |  |  |
First increments of share price receivable by executives at the time of vesting |  | 50.00% |
Second increments of share price receivable by executives at the time of vesting |  | 100.00% |
Deferred Share Units (DSUs) | Executive Officer |  |  |
SHARE BASED COMPENSATION |  |  |
First increments of share price receivable by executives at the time of vesting |  | 25.00% |
Second increments of share price receivable by executives at the time of vesting |  | 50.00% |
Third increments of share price receivable by executives at the time of vesting |  | 75.00% |
Fourth increments of share price receivable by executives at the time of vesting |  | 100.00% |
Syncrude Long Term Incentive Plans | Restricted Stock Units (RSUs) |  |  |
SHARE BASED COMPENSATION |  |  |
Value of shares to be converted | $ | $ 123 |  |
Conversion price per share | $ / shares | $ 30.93 |  |

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