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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of changes in unvested restricted stock A summary of the changes in unvested restricted stock during 2020, 2019 and 2018 is presented below:
Shares of
Unvested
Restricted Stock(a)
Weighted Average
Grant Date
Fair Value(a)
(in thousands)
Unvested restricted stock as of January 1, 202052 $710 
Granted68 $60 
Vested(21)$792 
Forfeited(98)$243 
Unvested restricted stock as of December 31, 20201 $617 
Unvested restricted stock as of January 1, 201959 $886 
Granted30 $530 
Vested(30)$876 
Forfeited(7)$744 
Unvested restricted stock as of December 31, 201952 $710 
Unvested restricted stock as of January 1, 201866 $1,274 
Granted30 $746 
Vested(29)$1,534 
Forfeited(8)$1,204 
Unvested restricted stock as of December 31, 201859 $886 
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(a)Amount has been retroactively adjusted to reflect a 1-for-200 (1:200) reverse stock split effective April 14, 2020. See Note 11 for additional information.
Schedule of share-based payment assumptions We used the following weighted average assumptions to estimate the grant date fair value of the stock options granted in 2019:
Expected option life – years6.0
Volatility65.61 %
Risk-free interest rate2.47 %
Dividend yield— %
Schedule of information related to stock option activity
The following table provides information related to stock option activity for 2020, 2019 and 2018: 
Number of
Shares
Underlying  
Options
Weighted
Average
Exercise Price Per Share
Weighted  
Average
Contract Life in Years
Aggregate  
Intrinsic
Value(a)
(in thousands)($ in millions)
Outstanding as of January 1, 202090 $1,420 5.70$— 
Granted— $— 
Exercised
— $— $— 
Expired
(23)$915 
Forfeited
(47)$1,666 
Outstanding as of December 31, 202020 $1,429 4.27$— 
Exercisable as of December 31, 202019 $1,440 4.35$— 
Outstanding as of January 1, 201990 $1,440 7.15$— 
Granted5 $594 
Exercised
— $— $— 
Expired
(2)$1,272 
Forfeited
(3)$794 
Outstanding as of December 31, 201990 $1,420 5.70$— 
Exercisable as of December 31, 201965 $1,656 4.86$— 
Outstanding as of January 1, 201881 $1,650 7.73$1 
Granted18 $602 
Exercised
— $— $— 
Expired
(3)$2,766 
Forfeited
(6)$1,090 
Outstanding as of December 31, 201890 $1,440 7.15$— 
Exercisable as of December 31, 201841 $2,146 5.73$— 
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(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, net of actual forfeitures, related to restricted stock and stock options for the years ended December 31, 2020, 2019 and 2018:
 Years Ended December 31,
 202020192018
 ($ in millions)
General and administrative expenses$20 $26 $31 
Oil and natural gas properties1 2 2 
Oil, natural gas and NGL production expenses1 3 5 
Exploration expenses— 1 1 
Total restricted stock and stock option compensation$22 $32 $39 
We recognized the following compensation costs (credits), net of actual forfeitures, related to our liability-classified awards for the years ended December 31, 2020, 2019 and 2018:
 Years Ended December 31,
 202020192018
 ($ in millions)
General and administrative expenses$(3)$5 $9 
Oil and natural gas properties— 1 1 
Oil, natural gas and NGL production expenses(1)3 2 
Separation and other termination costs— 1 — 
Total liability-classified awards compensation$(4)$10 $12 
Summary of liability-classified awards
The following table presents a summary of our liability-classified awards:
Grant Date
Fair Value
December 31, 2020
Units(a)
Fair ValueVested Liability
($ in millions)($ in millions)
2018 CRSU Awards:
Payable 202113,351 $8 $— $— 
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(a) Amount has been retroactively adjusted to reflect a 1-for-200 (1:200) reverse stock split effective April 14, 2020. See Note 11 for additional information.