Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

Composition of Stock-Based Compensation Expense
	Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	2015		2014		2015		2014
Corporate expense	$	23	$	12	$	35	$	19
Property, general, administrative, and other	8		12		22		31
Total stock-based compensation expense	$	31	$	24	$	57	$	50

Schedule of Share-based Compensation, Activity [Table Text Block]

Stock Option Activity
	June 30, 2015			December 31, 2014
	Shares	Wtd Avg Exercise Price		Shares	Wtd Avg Exercise Price
Outstanding at end of period	10,662,153	$	13.02	9,379,885	$	13.65
Granted during 2015	1,629,641	10.68		N/A	N/A

Restricted Stock Unit Activity
	June 30, 2015			December 31, 2014
	Shares	Wtd Avg Fair Value		Shares	Wtd Avg Fair Value
Outstanding at end of period	6,297,028	$	12.48	2,156,727	$	17.45
Granted during 2015	4,981,883	10.67		N/A	N/A

Schedule of Share-based Compensation, Activity, CIE [Table Text Block]

Stock Option Activity
	June 30, 2015			December 31, 2014
	Shares	Wtd Avg Exercise Price		Shares	Wtd Avg Exercise Price
Outstanding at end of period	13,040	$	4,862.96	13,279	$	3,953.85
Granted during 2015	1,325	13,192.23		N/A	N/A

Restricted Stock Unit Activity
	June 30, 2015			December 31, 2014
	Shares	Wtd Avg Fair Value		Shares	Wtd Avg Fair Value
Outstanding at end of period	5,351	$	7,178.96	5,096	$	6,494.71
Granted during 2015	701	12,761.81		N/A	N/A