Income (Loss) per Share (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic weighted average common shares outstanding (in shares)	860	852	859	851
Dilutive effect of awards granted under our stock incentive plans	0	2	0	0
Diluted weighted average common shares outstanding (in shares)	860	854	859	851
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options with exercise price greater than the average market price	11	5	14	7
Options which ordinarily would be considered dilutive if not for being in net loss position	2	0	1	2
Total antidilutive shares	13	5	15	9