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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of changes in unvested restricted stock | A summary of the changes in unvested restricted stock during 2019, 2018 and 2017 is presented below:
|  | Shares of Unvested Restricted Stock |  | Weighted Average Grant Date Fair Value
|  | (in thousands) |  |
Unvested restricted stock as of January 1, 2019 |  | 11,858 |  |  | $ | 4.43 |
Granted |  | 5,908 |  |  | $ | 2.65 |
Vested |  | (5,944 | ) |  | $ | 4.38 |
Forfeited |  | (1,380 | ) |  | $ | 3.72 |
Unvested restricted stock as of December 31, 2019 |  | 10,442 |  |  | $ | 3.55 |
Unvested restricted stock as of January 1, 2018 |  | 13,178 |  |  | $ | 6.37 |
Granted |  | 6,067 |  |  | $ | 3.73 |
Vested |  | (5,808 | ) |  | $ | 7.67 |
Forfeited |  | (1,579 | ) |  | $ | 6.02 |
Unvested restricted stock as of December 31, 2018 |  | 11,858 |  |  | $ | 4.43 |
Unvested restricted stock as of January 1, 2017 |  | 9,092 |  |  | $ | 11.39 |
Granted |  | 9,872 |  |  | $ | 5.40 |
Vested |  | (4,573 | ) |  | $ | 13.73 |
Forfeited |  | (1,213 | ) |  | $ | 8.32 |
Unvested restricted stock as of December 31, 2017 |  | 13,178 |  |  | $ | 6.37 |
Schedule of share-based payment assumptions | We used the following weighted average assumptions to estimate the grant date fair value of the stock options granted in 2019:
Expected option life – years |  | 6.0 |
Volatility |  | 65.61 | %
Risk-free interest rate |  | 2.47 | %
Dividend yield |  | — | %
Schedule of information related to stock option activity | The following table provides information related to stock option activity for 2019, 2018 and 2017:
|  | Number of Shares Underlying Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Contract Life in Years |  | Aggregate Intrinsic Value(a)
|  | (in thousands) |  |  |  |  |  | ($ in millions)
Outstanding as of January 1, 2019 |  | 18,096 |  |  | $ | 7.20 |  |  | 7.15 |  | $ | — |
Granted |  | 1,000 |  |  | $ | 2.97 |  |  |  |  |
Exercised |  | — |  |  | $ | — |  |  |  |  | $ | — |
Expired |  | (553 | ) |  | $ | 6.36 |  |  |  |  |
Forfeited |  | (609 | ) |  | $ | 3.97 |  |  |  |  |
Outstanding as of December 31, 2019 |  | 17,934 |  |  | $ | 7.10 |  |  | 5.70 |  | $ | — |
Exercisable as of December 31, 2019 |  | 13,092 |  |  | $ | 8.28 |  |  | 4.86 |  | $ | — |
Outstanding as of January 1, 2018 |  | 16,285 |  |  | $ | 8.25 |  |  | 7.73 |  | $ | 1 |
Granted |  | 3,611 |  |  | $ | 3.01 |  |  |  |  |
Exercised |  | — |  |  | $ | — |  |  |  |  | $ | — |
Expired |  | (602 | ) |  | $ | 13.83 |  |  |  |  |
Forfeited |  | (1,198 | ) |  | $ | 5.45 |  |  |  |  |
Outstanding as of December 31, 2018 |  | 18,096 |  |  | $ | 7.20 |  |  | 7.15 |  | $ | — |
Exercisable as of December 31, 2018 |  | 8,250 |  |  | $ | 10.73 |  |  | 5.73 |  | $ | — |
Outstanding as of January 1, 2017 |  | 8,593 |  |  | $ | 11.88 |  |  | 7.22 |  | $ | 14 |
Granted |  | 9,226 |  |  | $ | 5.45 |  |  |  |  |
Exercised |  | — |  |  | $ | — |  |  |  |  | $ | — |
Expired |  | (435 | ) |  | $ | 18.50 |  |  |  |  |
Forfeited |  | (1,099 | ) |  | $ | 9.12 |  |  |  |  |
Outstanding as of December 31, 2017 |  | 16,285 |  |  | $ | 8.25 |  |  | 7.73 |  | $ | 1 |
Exercisable as of December 31, 2017 |  | 4,474 |  |  | $ | 15.15 |  |  | 5.26 |  | $ | — |
___________________________________________ (a) The intrinsic value of a stock option is the amount by which the current market value or the market value upon exercise of the underlying stock exceeds the exercise price of the option.
Schedule of compensation costs (credit), net of actual forfeitures | We recognized the following compensation costs (credits), net of actual forfeitures, related to our liability-classified awards for the years ended December 31, 2019, 2018 and 2017:
|  | Years Ended December 31,
|  | 2019 |  | 2018 |  | 2017
|  | ($ in millions)
General and administrative expenses |  | $ | 5 |  |  | $ | 9 |  |  | $ | (4 | )
Oil and natural gas properties |  | 1 |  |  | 1 |  |  | — |
Oil, natural gas and NGL production expenses |  | 3 |  |  | 2 |  |  | — |
Restructuring and other termination costs |  | 1 |  |  | — |  |  | — |
Total liability-classified awards compensation |  | $ | 10 |  |  | $ | 12 |  |  | $ | (4 | )
We recognized the following compensation costs, net of actual forfeitures, related to restricted stock and stock options for the years ended December 31, 2019, 2018 and 2017:
|  | Years Ended December 31,
|  | 2019 |  | 2018 |  | 2017
|  | ($ in millions)
General and administrative expenses |  | $ | 26 |  |  | $ | 31 |  |  | $ | 43 |
Oil and natural gas properties |  | 2 |  |  | 2 |  |  | 5 |
Oil, natural gas and NGL production expenses |  | 3 |  |  | 5 |  |  | 12 |
Exploration expenses |  | 1 |  |  | 1 |  |  | 1 |
Total restricted stock and stock option compensation |  | $ | 32 |  |  | $ | 39 |  |  | $ | 61 |
Summary of liability-classified awards | The following table presents a summary of our liability-classified awards:
|  |  |  | Grant Date Fair Value |  | December 31, 2019
|  | Units |  |  | Fair Value |  | Vested Liability
|  |  |  | ($ in millions) |  | ($ in millions)
2019 PSU Awards: |  |  |  |  |  |  |  |
Payable 2020, 2021 and 2022 |  | 4,674,503 |  |  | $ | 14 |  |  | $ | 4 |  |  | $ | — |
2018 PSU Awards: |  |  |  |  |  |  |  |
Payable 2020 and 2021 |  | 2,340,157 |  |  | $ | 7 |  |  | $ | 2 |  |  | $ | — |
2017 PSU Awards: |  |  |  |  |  |  |  |
Payable 2020 |  | 1,174,973 |  |  | $ | 8 |  |  | $ | 1 |  |  | $ | — |
2018 CRSU Awards: |  |  |  |  |  |  |  |
Payable 2020 and 2021 |  | 8,233,207 |  |  | $ | 25 |  |  | $ | 7 |  |  | $ | — |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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