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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Equity Incentive Plan
The share-based compensation expense under the Incentive Plans for the years ended December 31, 2021, 2020 and 2019, was as follows:
2021
2020
2019
Equity-based awards$8 $4 $4 
Liability-based awards30 10 (2)
$38 $14 $2 
Schedule of Stock Options Activity
The activity of outstanding stock options for the year ended December 31, 2021, was as follows:
Number of
Shares		Weighted-
Average
Exercise
Price		Weighted-
Average
Contractual
Life (years)
Balance as of December 31, 2020
912,901 $16.09 1.8
Exercised(118,485)11.80 
Forfeited(151,442)14.40 
Expired(253,988)20.76 
Balance as of December 31, 2021
388,986 $15.00 1.7
Exercisable as of December 31, 2021
388,986 $15.00 1.7
Schedule of RSU and DSU Activity
The activity of nonvested RSUs and DSUs for the year ended December 31, 2021, was as follows:
Number of Units
Equity-Based AwardsLiability-Based AwardsTotalWeighted-
Average Fair
Value at Grant
Date
Balance as of December 31, 20201,279,015 1,128,264 2,407,279 $5.14
Granted354,311 554,771 909,082 $10.40
Vested(750,452)(747,647)(1,498,099)$6.38
Forfeited— (101,457)(101,457)$5.23
Balance as of December 31, 2021882,874 833,931 1,716,805 $6.84
Schedule of Fair Value Assumptions of PSUs The fair value of PSUs granted was estimated using a Monte Carlo simulation model, using the following assumptions:
202120202019
Expected volatility (1)
76% - 82%
57% - 77%
56% - 58%
Risk-free interest rate
0.06%- 0.96%
0.11% - 2.99%
1.58% - 1.70%
(1)The volatility is based on our historical volatility over the expected remaining life of the award.
Schedule of PSU Activity
The activity of nonvested PSUs for the year ended December 31, 2021, was as follows:
Number of Units
Equity-Based AwardsLiability-Based AwardsTotalWeighted-
Average Fair
Value at Grant
Date
Balance as of December 31, 20201,795,403 1,311,327 3,106,730 $6.05 
Granted402,306 333,722 736,028 $10.60 
Vested(387,616)(433,418)(821,034)$8.20 
Performance adjustment45,199 52,201 97,400 $8.58 
Forfeited— (114,367)(114,367)$5.48 
Balance as of December 31, 20211,855,292 1,149,465 3,004,757 $6.69