Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Schedule Of Valuation Assumptions

Assumptions	2015	2014	2013
Risk-free interest rate	1.7%	1.6%	1.5%
Expected dividend yield	–	–	–
Expected volatility	36.0%	32.5%	38.6%
Expected term	5 years	5 years	5 years

Summary Of Stock Option Activity

	2015			2014			2013
		Weighted			Weighted			Weighted
		Average			Average			Average
	Number	Exercise		Number	Exercise		Number	Exercise
	of Shares	Price		of Shares	Price		of Shares	Price
	(in thousands)			(in thousands)			(in thousands)
Options outstanding at January 1	3,622	$	35.41	3,313	$	35.70	3,650	$	29.84
Granted	2,401		9.47	835		32.31	571		38.95
Exercised	–		–	(402)		30.60	(833)		12.12
Forfeited or expired	(400)		32.20	(124)		37.80	(75)		37.31
Options outstanding at December 31	5,623	$	24.57	3,622	$	35.41	3,313	$	35.70

Summary Of Stock Options Outstanding And Options Exercisable

	Options Outstanding				Options Exercisable
				Weighted				Weighted
				Average				Average
	Options	Weighted		Remaining	Options	Weighted		Remaining
	Outstanding at	Average		Contractual	Exercisable at	Average		Contractual
Range of	December 31,	Exercise		Life	December 31,	Exercise		Life
Exercise Prices	2015	Price		(Years)	2015	Price		(Years)
	(in thousands)				(in thousands)
$7.74-$29.69	2,421		9.63	6.8	20		28.46	1.8
$30.59-$35.91	1,397		32.32	4.9	900		33.27	4.3
$36.22-$39.68	1,412		37.50	3.4	1,249		37.31	3.2
$40.15-$51.47	393		42.58	2.0	333		41.86	1.4
	5,623	$	24.57	5.1	2,502	$	36.39	3.4

Summary Of Restricted Stock Activity

	2015			2014			2013
	Number of Shares		Weighted Average Grant Date Fair Value	Number of Shares		Weighted Average Grant Date Fair Value	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)			(in thousands)			(in thousands)
Unvested shares at January 1	2,376	$	34.00	1,771	$	37.55	1,118	$	35.64
Granted	5,822		8.07	1,295		30.89	1,109		38.92
Vested	(873)		33.33	(548)		37.12	(382)		36.29
Forfeited	(103)		29.14	(142)		37.91	(74)		35.81
Unvested shares at December 31	7,222	$	13.24	2,376	$	34.00	1,771	$	37.55

Summary Of Equity-Classified Performance Units Activity

	2015			2014
	Number of Units (1)	Weighted Average Grant Date Fair Value		Number of Units (1)	Weighted Average Grant Date Fair Value
Unvested shares at January 1	223	$	40.44	–	$	–
Granted	443		35.22	359		40.44
Vested	(259)		37.46	(111)		40.44
Forfeited	–		–	(25)		40.44
Unvested shares at December 31	407	$	36.65	223	$	40.44

(1) These amounts reflect the number of performance units granted in thousands. The actual payout of shares may range from a minimum of zero shares to a maximum of two shares contingent upon the actual performance against the Performance Measures.

Stock Options [Member]

Schedule Of Stock-Based Compensation Costs

	2015		2014		2013
	(in millions)
Stock-based compensation cost related to stock options – general and administrative expense	$	5	$	5	$	5
Stock-based compensation cost related to stock options – capitalized	$	3	$	4	$	5

Restricted Stock [Member]

Schedule Of Stock-Based Compensation Costs

		2015		2014		2013
		(in millions)
Stock-based compensation cost related to restricted stock grants – general and administrative expense	$	14	$	10	$	7
Stock-based compensation cost related to restricted stock grants – capitalized	$	16	$	12	$	7

Equity-Classified Performance Units [Member]

Schedule Of Stock-Based Compensation Costs

		a
	2015		2014
	(in millions)
Stock-based compensation cost related to performance units - general and administrative expense	$	6	$	3
Stock-based compensation cost related to performance units - capitalized	$	4	$	2