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SHARE-BASED COMPENSATION - RSUs (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 | $ 68 |  |
Total fair value | $ 69 | $ 66 | $ 34
Weighted-average remaining requisite service period over which unrecognized compensation cost is expected to be amortized | 1 year 7 months 6 days |  |
RSUs |  |  |
Beginning of the period (in shares) | 5,700,000 |  |
Granted (in shares) | 3,400,000 |  |
Vested (in shares) | (3,300,000) |  |
Forfeited (in shares) | (400,000) |  |
End of the period (in shares) | 5,400,000 | 5,700,000 |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Beginning of the period (in dollars per share) | $ 21.98 |  |
Granted (in dollars per share) | 31.51 |  |
Vested (in dollars per share) | 21.00 |  |
Forfeited (in dollars per share) | 26.77 |  |
End of the period (in dollars per share) | $ 28.16 | $ 21.98 |
Performance-Based Restricted Stock Units |  |  |
Share-based compensation |  |  |
Remaining unrecognized compensation expense related to non-vested awards | $ 32 |  |
Weighted-average remaining requisite service period over which unrecognized compensation cost is expected to be amortized | 1 year 8 months 12 days |  |
Maximum common shares issuable upon vesting (in shares) | 3,476,000 |  |
RSUs |  |  |
Beginning of the period (in shares) | 2,300,000 |  |
Granted (in shares) | 1,035,000 |  |
Vested (in shares) | (1,000,000.0) |  |
End of the period (in shares) | 2,300,000 | 2,300,000 |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Beginning of the period (in dollars per share) | $ 28.10 |  |
Granted (in dollars per share) | 40.42 |  |
Vested (in dollars per share) | 27.23 |  |
End of the period (in dollars per share) | $ 33.92 | $ 28.10 |
Method and assumptions on valuation of stock options |  |  |
Contractual term (years) | 3 years | 3 years | 3 years
Expected Company share volatility | 52.00% | 38.60% | 46.50%
Risk-free interest rate | 0.40% | 1.20% | 2.50%
TSR Performance-Based Restricted Stock Units |  |  |
RSUs |  |  |
Granted (in shares) | 400,000 |  |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Granted (in dollars per share) | $ 56.04 |  |
ROTC Performance-Based Restricted Stock Units |  |  |
RSUs |  |  |
Granted (in shares) | 413,000 |  |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Granted (in dollars per share) | $ 31.72 |  |
Other Performance Based Restricted Stock Units |  |  |
RSUs |  |  |
Granted (in shares) | 222,000 |  |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Granted (in dollars per share) | $ 28.49 |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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