Income (Loss) per Share (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic weighted average common shares outstanding (in shares)	862	855	860	852
Dilutive effect of awards granted under our stock incentive plans	2	0	0	0
Diluted weighted average common shares outstanding (in shares)	864	855	860	852
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options with exercise price greater than the average market price	12	13	13	10
Options which ordinarily would be considered dilutive if not for being in net loss position	0	2	1	2
Total antidilutive shares	12	15	14	12