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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Summary of restricted stock, restricted stock unit and stock option activity

The following table summarizes RSU and stock option activity:

			RSUs						Stock Options
			Number			Weighted Average Grant Date Fair Value Per Share			Number			Weighted Average Exercise Price Per Share
Outstanding as of December 31, 2019			1,660,311			$39.88			5,381,477			$52.13
Granted			1,355,975			10.30			975,290			11.06
Forfeited or expired			(114,352)			33.74			(603,835)			59.46
Vested/exercised			(643,340)			42.23			—			—
Outstanding as of December 31, 2020			2,258,594			$21.76			5,752,932			$44.40
Granted			596,391			18.67			481,626			17.96
Forfeited or expired			(132,713)			18.78			(659,216)			58.37
Vested/exercised			(810,560)			30.83			(84,416)			8.81
Outstanding as of December 31, 2021			1,911,712			$17.16			5,490,926			$40.95
Granted			415,356			22.36			250,656			21.90
Forfeited or expired			(2,937)			25.55			(846,621)			61.46
Vested/exercised			(957,640)			22.01			(217,397)			15.20
Outstanding as of December 31, 2022			1,366,491			$15.33			4,677,564			$37.41
Options exercisable as of December 31, 2022									3,689,284			$43.03
Remaining unvested options outstanding and expected to vest									978,397			$16.46

During the first quarter of 2022, the following units were granted (under GAAP) based upon the establishment of performance targets:

			Performance-based Award Units Granted in 2022			Weighted Average Grant Date Fair Value Per Share
2022 Performance Award Plan			142,319			$24.07
2021 Performance Award Plan			204,623			$25.75
2020 Performance Award Plan			385,455			$27.90

Schedule of fair value on grant date and significant assumptions used in Black-Scholes option-pricing model

The grant date fair value of options and other significant assumptions follow:

			2022			2021			January 1 - November 30, 2020			December 31, 2020
Weighted average grant date fair value			$11.19			$8.94			$4.59			$9.05
Expected life of options (in years)			4.5			4.5			4.6			7.2
Risk-free interest rate			1.9		%	0.7		%	0.4		%	0.5		%
Expected volatility			62		%	62		%	65		%	61		%
Expected annual dividend per share			$0.00			$0.00			$0.00			$0.00

Summary of information related to options outstanding

Information related to options outstanding as of December 31, 2022 follows:

			Options Outstanding												Options Exercisable
Range of Exercise Prices			Number Outstanding			Weighted Average Remaining Contractual Life (In Years)			Weighted Average Exercise Price Per Share						Number Exercisable			Weighted Average Remaining Contractual Life (In Years)			Weighted Average Exercise Price Per Share
$8.81 - $29.50			2,431,911			7.6			$	18.29					1,443,631			7.1			$	19.54
$46.07 - $62.50			1,986,231			3.1			55.37						1,986,231			3.1			55.37
$70.76 - $79.19			259,422			1.1			79.19						259,422			1.1			79.19
			4,677,564			5.3			$	37.41					3,689,284			4.5			$	43.03

Disclosure of compensation Arrangements by share-based payment award

						Location in Statement of Operations						December 31,
Compensation Expense (in millions)												2022						2021						2020
SGI awards						G&A						$	54					$	67					$	25
Performance-based awards for non-Section 16 executives						G&A						14						1						3

Liabilities (in millions)						Location on Balance Sheet			December 31, 2022						December 31, 2021
SGI awards						Accrued salaries, wages and benefits and Other noncurrent liabilities			$	92					$	73
Performance-based awards for non-Section 16 executives						Accrued salaries, wages and benefits and Other noncurrent liabilities			15						8

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Tabular disclosure of share-based payment arrangement.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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