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EQUITY COMPENSATION PLANS - Stock Options (Details) - Stock Options - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock incentive and option plans |  |  |
Stock option expiration period | 10 years |  |
Stock option vesting period | 3 years |  |
SHARES |  |  |
Outstanding, beginning of year (in shares) | 9,042,320 | 10,516,633 | 11,380,013
Granted (in shares) | 931,750 | 879,862 | 1,202,314
Exercised (in shares) | (2,733,130) | (2,270,374) | (1,942,192)
Canceled (in shares) | (91,660) | (83,801) | (123,502)
Separation of ChampionX | (346,865) |  |
Outstanding, end of year (in shares) | 6,802,415 | 9,042,320 | 10,516,633
Exercisable, end of year (in shares) | 5,051,927 | 7,048,422 | 7,993,297
Vested and expected to vest, end of year (in shares) | 6,697,614 |  |
AVERAGE PRICE PER SHARE |  |  |
Outstanding, beginning of year (in dollars per share) | $ 121.72 | $ 108.28 | $ 95.76
Granted (in dollars per share) | 220.95 | 184.31 | 158.23
Exercised (in dollars per share) | 97.52 | 82.93 | 64.63
Canceled (in dollars per share) | 166.67 | 143.08 | 127.02
Separation of ChampionX (in dollars per share) | 126.37 |  |
Outstanding, end of year (in dollars per share) | 144.20 | 121.72 | 108.28
Exercisable, end of year (in dollars per share) | 125.08 | $ 109.34 | $ 97.13
Vested and expected to vest, end of year (in dollars per shares) | $ 143.25 |  |
Total intrinsic value of options exercised during period | $ 299 | $ 227 | $ 161
Total aggregate intrinsic value of in-the-money options outstanding | $ 492 |  |
Weighted-average remaining contractual life of options outstanding | 6 years 7 months 6 days |  |
Total aggregate intrinsic value of in-the-money options exercisable | $ 458 |  |
Weighted-average remaining contractual life of options exercisable | 5 years 8 months 12 days |  |
Aggregate intrinsic value of vested and expected to vest options outstanding | $ 491 |  |
Weighted-average remaining contractual life of vested and expected to vest options outstanding | 6 years 6 months |  |

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