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EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Total Outstanding Shares | Total outstanding shares of common stock and treasury stock were as follows:
(in millions) |  | Shares of Common Stock |  | Shares of Treasury Stock |  | Outstanding Shares
Balance at December 31, 2017 |  | 264.5 |  |  | (37.7) |  |  | 226.8 |
Shares of treasury stock issued |  | — |  |  | 1.6 |  |  | 1.6 |
Repurchase of common stock at an average cost of $45.92 |  | — |  |  | (5.4) |  |  | (5.4) |
Balance at December 31, 2018 |  | 264.5 |  |  | (41.5) |  |  | 223.0 |
Shares of treasury stock issued |  | — |  |  | 3.1 |  |  | 3.1 |
Repurchase of common stock at an average cost of $54.18 |  | — |  |  | (4.8) |  |  | (4.8) |
Balance at December 31, 2019 |  | 264.5 |  |  | (43.2) |  |  | 221.3 |
Shares of treasury stock issued |  | — |  |  | 1.1 |  |  | 1.1 |
Repurchase of common stock at an average cost of $38.25 |  | — |  |  | (3.7) |  |  | (3.7) |
Balance at December 31, 2020 |  | 264.5 |  |  | (45.8) |  |  | 218.7 |
Schedule of Total Stock Based Compensation Expense and the Tax Related Benefit | Total stock based compensation expense and the tax related benefit were as follows:
|  | Year End December 31,
(in millions) |  | 2020 |  | 2019 |  | 2018
Stock option expense |  | $ | 7 |  |  | $ | 7 |  |  | $ | 7 |
RSU expense |  | 39 |  |  | 58 |  |  | 13 |
Total stock based compensation expense |  | $ | 46 |  |  | $ | 65 |  |  | $ | 20 |
Related deferred income tax benefit |  | $ | 5 |  |  | $ | 8 |  |  | $ | 2 |
Schedule of Assumptions Used to Determine Compensation Cost for the Company's Non-qualified Stock Options Issued | The average assumptions used to determine compensation cost for the Company’s NQSOs issued were as follows:
|  | Year End December 31,
|  | 2020 |  | 2019 |  | 2018
Weighted average fair value per share |  | $ | 10.03 |  |  | $ | 12.20 |  |  | $ | 12.38 |
Expected dividend yield |  | 0.84 | % |  | 0.71 | % |  | 0.64 | %
Risk-free interest rate |  | 0.77 | % |  | 2.36 | % |  | 2.72 | %
Expected volatility |  | 24.0 | % |  | 22.6 | % |  | 19.7 | %
Expected life (years) |  | 5.49 |  | 6.00 |  | 6.07
Schedule of Non-qualified Stock Option Transactions | The NQSO transactions for the year ended December 31, 2020 were as follows:
|  | Outstanding |  | Exercisable
(in millions, except per share amounts) |  | Shares |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value |  | Shares |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
December 31, 2019 |  | 3.8 |  |  | $ | 50.02 |  |  | $ | 28 |  |  | 2.7 |  |  | $ | 48.85 |  |  | $ | 23 |
Granted |  | 0.7 |  |  | 47.84 |  |  |  |  |  |  |  |  |
Exercised |  | (0.3) |  |  | 39.59 |  |  |  |  |  |  |  |  |
Cancelled |  | (0.2) |  |  | 56.21 |  |  |  |  |  |  |  |  |
December 31, 2020 |  | 4.0 |  |  | $ | 50.01 |  |  | $ | 17 |  |  | 2.7 |  |  | $ | 50.28 |  |  | $ | 12 |
Schedule of Information about Non-qualified Stock Options Outstanding | Information about NQSOs outstanding for the year ended December 31, 2020 were as follows:
|  |  |  | Outstanding |  | Exercisable
|  | Number Outstanding at December 31, 2020 |  | Weighted Average Remaining Contractual Life (in years) |  | Weighted Average Exercise Price |  | Number Exercisable at December 31, 2020 |  | Weighted Average Exercise Price
Range of Exercise Prices |  |  |  |  |
(in millions, except per share amounts and life) |  |  |  |  |
30.01 |  | - | 40.00 |  | 0.4 |  |  | 1.5 |  | $ | 37.54 |  |  | 0.4 |  |  | $ | 37.55 |
40.01 |  | - | 50.00 |  | 2.0 |  |  | 6.3 |  | 46.83 |  |  | 0.9 |  |  | 45.22 |
50.01 |  | - | 60.00 |  | 1.2 |  |  | 4.8 |  | 54.82 |  |  | 1.0 |  |  | 54.69 |
60.01 |  | - | 70.00 |  | 0.4 |  |  | 5.2 |  | 62.26 |  |  | 0.4 |  |  | 62.25 |
|  |  |  | 4.0 |  |  | 5.3 |  | $ | 50.01 |  |  | 2.7 |  |  | $ | 50.28 |
Schedule of the Unvested RSU Transactions | The unvested RSU transactions for the year ended December 31, 2020 were as follows:
|  | Unvested Restricted Stock Units
|  | Shares |  | Weighted Average Grant Date Fair Value
(in millions, except per share amounts) |  |
Unvested at December 31, 2019 |  | 4.5 |  |  | $ | 47.79 |
Granted |  | 1.0 |  |  | 49.40 |
Vested |  | (0.9) |  |  | 49.74 |
Forfeited |  | (0.4) |  |  | 46.16 |
Unvested at December 31, 2020 |  | 4.2 |  |  | $ | 47.29 |

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