Stock-Based and Other Compensation Plans - Assumptions and Award Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options
Exercised (in shares)	(382,882)	(954,898)
Stock Option
Assumptions used to value stock option awards [Abstract]
Expected term (in years)	6 years 4 months 24 days	6 years 3 months 18 days	6 years
Expected volatility (in hundredths)	33.20%	32.40%	32.60%
Risk-free rate (in hundredths)	2.20%	1.60%	1.40%
Expected dividend yield (in hundredths)	0.90%	0.70%	1.20%
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 13.26	$ 10.10	$ 13.93
Options
Outstanding, beginning balance (in shares)	15,088,862
Granted (in shares)	1,819,819
Exercised (in shares)	(382,882)
Forfeited (in shares)	(976,577)
Outstanding, ending balance (in shares)	15,549,222	15,088,862
Exercisable (in shares)	12,101,890
Weighted Average Exercise Price
Weighted average exercise price per share outstanding, beginning balance (in dollars per share)	$ 43.49
Weighted average exercise price per share granted (in dollars per share)	39.40
Weighted average exercise price per share exercised (in dollars per share)	37.57
Weighted average exercise price per share forfeited (in dollars per share)	43.93
Weighted average exercise price per share outstanding, ending balance (in dollars per share)	43.42	$ 43.49
Weighted average exercise price per exercisable share (in dollars per share)	$ 44.98
Weighted average remaining contractual term of shares outstanding (in years)	5 years
Weighted average remaining contractual term, exercisable shares (in years)	4 years
Aggregate intrinsic value of shares outstanding	$ 6
Aggregate intrinsic value, exercisable shares	$ 6
Restricted Stock
Assumptions used to value stock option awards [Abstract]
Expected volatility (in hundredths)	35.00%	38.00%	30.00%
Risk-free rate (in hundredths)	1.50%	1.00%	0.80%
Weighted Average Award Date Fair Value
Weighted average award date fair value, shares awarded (in dollars per share)	$ 35.45	$ 29.99	$ 35.53
Subject to Time Vesting \| Restricted Stock
Number of Shares
Outstanding, beginning balance (in shares)	1,371,780
Awarded (in shares)	3,201,504
Vested (in shares)	(2,515,383)
Forfeited (in shares)	(218,164)
Outstanding, ending balance (in shares)	1,839,737	1,371,780
Weighted Average Award Date Fair Value
Weighted average award date fair value, beginning of period (in dollars per share)	$ 36.37
Weighted average award date fair value, shares awarded (in dollars per share)	36.26
Weighted average award date fair value, shares vested (in dollars per share)	34.93
Weighted average award date fair value, shares forfeited (in dollars per share)	37.66
Weighted average award date fair value, end of period (in dollars per share)	$ 37.21	$ 36.37
Subject to Time Vesting \| Phantom Share Units (PSUs)
Number of Shares
Outstanding, beginning balance (in shares)	712,089
Vested (in shares)	(13,305)
Forfeited (in shares)	(88,625)
Outstanding, ending balance (in shares)	610,159	712,089
Weighted Average Award Date Fair Value
Weighted average award date fair value, beginning of period (in dollars per share)	$ 31.65
Weighted average award date fair value, shares vested (in dollars per share)	31.65
Weighted average award date fair value, shares forfeited (in dollars per share)	31.65
Weighted average award date fair value, end of period (in dollars per share)	$ 31.65	$ 31.65
Subject to Market Conditions \| Restricted Stock
Number of Shares
Outstanding, beginning balance (in shares)	1,502,992
Awarded (in shares)	464,608
Vested (in shares)	(219,883)
Forfeited (in shares)	(535,012)
Outstanding, ending balance (in shares)	1,212,705	1,502,992
Weighted Average Award Date Fair Value
Weighted average award date fair value, beginning of period (in dollars per share)	$ 27.43
Weighted average award date fair value, shares awarded (in dollars per share)	24.25
Weighted average award date fair value, shares vested (in dollars per share)	44.61
Weighted average award date fair value, shares forfeited (in dollars per share)	33.12
Weighted average award date fair value, end of period (in dollars per share)	$ 25.55	$ 27.43
Subject to Market Conditions \| Phantom Share Units (PSUs)
Number of Shares
Outstanding, beginning balance (in shares)	209,504
Vested (in shares)	0
Forfeited (in shares)	(42,021)
Outstanding, ending balance (in shares)	167,483	209,504
Weighted Average Award Date Fair Value
Weighted average award date fair value, beginning of period (in dollars per share)	$ 6.82
Weighted average award date fair value, shares vested (in dollars per share)	0.00
Weighted average award date fair value, shares forfeited (in dollars per share)	6.82
Weighted average award date fair value, end of period (in dollars per share)	$ 6.82	$ 6.82
Clayton Williams Energy \| Restricted Stock
Number of Shares
Awarded (in shares)	1,900,000

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made 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).

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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).

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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.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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