Equity (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Schedule of Common Stock Outstanding Roll Forward

A summary of the changes in our common shares issued for the years ended December 31, 2016, 2015 and 2014 is detailed below.

	Years Ended December 31,
	2016	2015		2014
	(in thousands)
Shares issued as of January 1	664,796	664,944		666,192
Exchange of convertible notes	55,428	—		—
Exchange of senior notes	53,924	—		—
Conversion of preferred stock	120,186	—		—
Restricted stock issuances (net of forfeitures and cancellations)(a)	1,945	(163	)	(2,529	)
Stock option exercises	—	15		1,281
Shares issued as of December 31	896,279	664,796		664,944

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(a) The amount for 2014 reflects forfeitures upon the June 2014 spin-off of our oilfield services business.

Schedule of Stock by Class,Preferred Stock Conversion Terms

Following is a summary of our preferred stock, including the primary conversion terms as of December 31, 2016:

Preferred Stock Series	Issue Date	Liquidation Preference per Share		Holder's Conversion Right	Conversion Rate	Conversion Price		Company's Conversion Right From	Company's Market Conversion Trigger(a)
5.75% cumulative convertible non-voting	May and June 2010	$	1,000	Any time	39.6858	$	25.1979	May 17, 2015	$	32.7572
5.75% (series A) cumulative convertible non-voting	May 2010	$	1,000	Any time	38.3508	$	26.0751	May 17, 2015	$	33.8976
4.50% cumulative convertible	September 2005	$	100	Any time	2.4561	$	40.7152	September 15, 2010	$	52.9298
5.00% cumulative convertible (series 2005B)	November 2005	$	100	Any time	2.7745	$	36.0431	November 15, 2010	$	46.8560

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(a) Convertible at the Company's option if the trading price of the Company's common stock equals or exceeds the trigger price for a specified time period or after the applicable conversion date if there are less than 250,000 shares of 4.50% or 5.00% (Series 2005B) preferred stock outstanding or 25,000 shares of 5.75% or 5.75% (Series A) preferred stock outstanding.

Outstanding shares of our preferred stock for the years ended December 31, 2016, 2015 and 2014 are detailed below.

	5.75%		5.75% (A)		4.50%	5.00% (2005B)
	(in thousands)
Shares outstanding as of January 1, 2016	1,497		1,100		2,559	2,096
Preferred stock conversions/exchanges(a)	(654	)	(624	)	—	(134	)
Shares outstanding as of December 31, 2016	843		476		2,559	1,962
Shares outstanding as of January 1, 2015 and December 31, 2015	1,497		1,100		2,559	2,096
Shares outstanding as of January 1, 2014 and December 31, 2014	1,497		1,100		2,559	2,096

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(a) During 2016, holders of our 5.75% Cumulative Convertible Preferred Stock exchanged or converted 653,872 shares into 59,141,429 shares of common stock, holders of our 5.75% (Series A) Cumulative Convertible Preferred Stock exchanged or converted 624,137 shares into 60,032,734 shares of common stock and holders of our 5.00% (Series 2005B) Cumulative Convertible Preferred Stock exchanged or converted 134,000 shares into 1,012,032 shares of common stock. In connection with the exchanges noted above, we recognized a loss equal to the excess of the fair value of all common stock issued in exchange for the preferred stock over the fair value of the common stock issuable pursuant to the original terms of the preferred stock. The loss of $428 million is reflected as a reduction to net income available to common stockholders for the purpose of calculating earnings per common share.

Schedule of Stock by Class,Preferred Stock Shares Outstanding

Following is a summary of our preferred stock, including the primary conversion terms as of December 31, 2016:

Preferred Stock Series	Issue Date	Liquidation Preference per Share		Holder's Conversion Right	Conversion Rate	Conversion Price		Company's Conversion Right From	Company's Market Conversion Trigger(a)
5.75% cumulative convertible non-voting	May and June 2010	$	1,000	Any time	39.6858	$	25.1979	May 17, 2015	$	32.7572
5.75% (series A) cumulative convertible non-voting	May 2010	$	1,000	Any time	38.3508	$	26.0751	May 17, 2015	$	33.8976
4.50% cumulative convertible	September 2005	$	100	Any time	2.4561	$	40.7152	September 15, 2010	$	52.9298
5.00% cumulative convertible (series 2005B)	November 2005	$	100	Any time	2.7745	$	36.0431	November 15, 2010	$	46.8560

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(a) Convertible at the Company's option if the trading price of the Company's common stock equals or exceeds the trigger price for a specified time period or after the applicable conversion date if there are less than 250,000 shares of 4.50% or 5.00% (Series 2005B) preferred stock outstanding or 25,000 shares of 5.75% or 5.75% (Series A) preferred stock outstanding.

Outstanding shares of our preferred stock for the years ended December 31, 2016, 2015 and 2014 are detailed below.

	5.75%		5.75% (A)		4.50%	5.00% (2005B)
	(in thousands)
Shares outstanding as of January 1, 2016	1,497		1,100		2,559	2,096
Preferred stock conversions/exchanges(a)	(654	)	(624	)	—	(134	)
Shares outstanding as of December 31, 2016	843		476		2,559	1,962
Shares outstanding as of January 1, 2015 and December 31, 2015	1,497		1,100		2,559	2,096
Shares outstanding as of January 1, 2014 and December 31, 2014	1,497		1,100		2,559	2,096

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(a) During 2016, holders of our 5.75% Cumulative Convertible Preferred Stock exchanged or converted 653,872 shares into 59,141,429 shares of common stock, holders of our 5.75% (Series A) Cumulative Convertible Preferred Stock exchanged or converted 624,137 shares into 60,032,734 shares of common stock and holders of our 5.00% (Series 2005B) Cumulative Convertible Preferred Stock exchanged or converted 134,000 shares into 1,012,032 shares of common stock. In connection with the exchanges noted above, we recognized a loss equal to the excess of the fair value of all common stock issued in exchange for the preferred stock over the fair value of the common stock issuable pursuant to the original terms of the preferred stock. The loss of $428 million is reflected as a reduction to net income available to common stockholders for the purpose of calculating earnings per common share.

Schedule of Dividends Payable

Our preferred stock dividends for the year ended December 31, 2016 (paid in arrears) are detailed below.

	5.75%		5.75% (A)		4.50%		5.00% (2005B)
	($ in millions)
Dividends in arrears	$	48	$	27	$	12	$	10

Schedule of Accumulated Other Comprehensive Income (Loss)

For the years ended December 31, 2016 and 2015, changes in accumulated other comprehensive income (loss) for cash flow hedges, net of tax, are detailed below.

	Years Ended December 31,
	2016			2015
	($ in millions)
Balance, beginning of period	$	(99	)	$	(143	)
Other comprehensive income before reclassifications	(13		)	20
Amounts reclassified from accumulated other comprehensive income	16			24
Net other comprehensive income (loss)	3			44
Balance, end of period	$	(96	)	$	(99	)

Reclassification out of Accumulated Other Comprehensive Income

For the years ended December 31, 2016 and 2015, amounts reclassified from accumulated other comprehensive income (loss), net of tax, into the consolidated statements of operations are detailed below.

Details About Accumulated Other Comprehensive Income (Loss) Components	Affected Line Item in the Statement Where Net Income is Presented	Amounts Reclassified
		($ in millions)
Year Ended December 31, 2016
Net losses on cash flow hedges:
Commodity contracts	Oil, natural gas and NGL revenues	$	16
Foreign currency derivative	Gain (loss) on purchases or exchanges of debt	—
Total reclassifications for the period, net of tax		$	16
Year Ended December 31, 2015
Net losses on cash flow hedges:
Commodity contracts	Oil, natural gas and NGL revenues	$	23
Foreign currency derivative	Gain (loss) on purchases or exchanges of debt	1
Total reclassifications for the period, net of tax		$	24

Distributions Made to Limited Partner, by Distribution [Table Text Block]

For the years ended December 31, 2016, 2015 and 2014, the Trust declared and paid the following distributions:

Production Period	Distribution Date	Cash Distribution per Common Unit		Cash Distribution per Subordinated Unit
June 2016 – August 2016	December 1, 2016	$	0.0857	$	—
March 2016 – May 2016	August 29, 2016	$	0.0734	$	—
December 2015 – February 2016	May 31, 2016	$	0.0403	$	—
September 2015 – November 2015	March 1, 2016	$	0.2195	$	—
June 2015 – August 2015	November 30, 2015	$	0.3232	$	—
March 2015 – May 2015	August 31, 2015	$	0.3579	$	—
December 2014 – February 2015	June 1, 2015	$	0.3899	$	—
September 2014 – November 2014	March 2, 2015	$	0.4496	$	—
June 2014 – August 2014	December 1, 2014	$	0.5079	$	—
March 2014 – May 2014	August 29, 2014	$	0.5796	$	—
December 2013 – February 2014	May 30, 2014	$	0.6454	$	—
September 2013 – November 2013	March 3, 2014	$	0.6624	$	—