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STOCK INCENTIVE PLANS - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Weighted Average Price Per Share [Abstract] |  |  |
RSU expense | $ 32 | $ 27 | $ 23
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of shares vested | $ 31 | $ 19 | $ 22
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Outstanding at beginning of period (in shares) | 326,124 | 343,814 | 352,919
Issued (in shares) | 140,815 | 96,823 | 141,775
Canceled (in shares) | (26,254) | (36,224) | (56,393)
Vested (in shares) | (123,271) | (78,289) | (94,487)
Outstanding at end of period (in shares) | 317,414 | 326,124 | 343,814
Weighted Average Price Per Share [Abstract] |  |  |
Outstanding at beginning of period, weighted average price per share (in dollars per share) | $ 259.88 | $ 245.38 | $ 226.31
Issued, weighted average price per share (in dollars per share) | 252.11 | 299.25 | 284.98
Cancelled, weighted average price per share (in dollars per share) | 257.56 | 253.22 | 245.08
Vested, weighted average price per share (in dollars per share) | 252.05 | 247.96 | 233.75
Outstanding at end of period, weighted average price per share (in dollars per share) | $ 259.67 | $ 259.88 | $ 245.38
Unrecognized compensation | $ 41 |  |
Weighted average period to recognize (in years) | 1 year 10 months 24 days |  |
Minimum | Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 1 year |  |
Maximum | Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 7 years |  |

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