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SHARE-BASED COMPENSATION - RSUs (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
RSUs |  |  |
Share-based compensation |  |  |
Percentage of vesting rights | 33.00% |  |
Vesting period | 3 years |  |
Time-Based RSUs |  |  |
Share-based compensation |  |  |
Remaining unrecognized compensation expense related to non-vested awards | $ 55 |  |
Total fair value | $ 66 | $ 34 | $ 30
Weighted-average remaining requisite service period over which unrecognized compensation cost is expected to be amortized | 1 year 6 months |  |
RSUs |  |  |
Beginning of the period (in shares) | 6,100,000 |  |
Granted (in shares) | 3,300,000 |  |
Vested (in shares) | (3,400,000) |  |
Forfeited (in shares) | (300,000) |  |
End of the period (in shares) | 5,700,000 | 6,100,000 |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Beginning of the period (in dollars per share) | $ 20.54 |  |
Granted (in dollars per share) | 21.92 |  |
Vested (in dollars per share) | 19.37 |  |
Forfeited (in dollars per share) | 21.78 |  |
End of the period (in dollars per share) | $ 21.98 | $ 20.54 |
Performance-Based Restricted Stock Units |  |  |
Share-based compensation |  |  |
Remaining unrecognized compensation expense related to non-vested awards | $ 22 |  |
Weighted-average remaining requisite service period over which unrecognized compensation cost is expected to be amortized | 1 year 4 months 24 days |  |
Maximum common shares issuable upon vesting (in shares) | 3,729,000 |  |
RSUs |  |  |
Beginning of the period (in shares) | 2,000,000.0 |  |
Granted (in shares) | 897,000 |  |
Vested (in shares) | (600,000) |  |
End of the period (in shares) | 2,300,000 | 2,000,000.0 |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Beginning of the period (in dollars per share) | $ 25.80 |  |
Granted (in dollars per share) | 26.61 |  |
Vested (in dollars per share) | 19.02 |  |
End of the period (in dollars per share) | $ 28.10 | $ 25.80 |
Method and assumptions on valuation of stock options |  |  |
Contractual term (years) | 3 years | 3 years | 3 years
Expected Company share volatility | 38.60% | 46.50% | 54.20%
Risk-free interest rate | 1.20% | 2.50% | 2.70%
Performance-Based Restricted Stock Units | Chief Executive Officer |  |  |
Share-based compensation |  |  |
Aggregate value of long term incentive awards |  |  | $ 10
Number of shares canceled (in shares) |  |  | 933,000
TSR Performance-Based Restricted Stock Units |  |  |
RSUs |  |  |
Granted (in shares) | 425,000 |  |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Granted (in dollars per share) | $ 26.13 |  |
ROTC Performance-Based Restricted Stock Units |  |  |
RSUs |  |  |
Granted (in shares) | 472,000 |  |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Granted (in dollars per share) | $ 27.05 |  |

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