Income (Loss) per Share (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic weighted average common shares outstanding (in shares)	890	877	889	877
Dilutive effect of awards granted under our stock incentive plans	0	0	0	0
Diluted weighted average common shares outstanding (in shares)	890	877	889	877
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options with exercise price greater than the average market price	22	27	22	27
Shares which are antidilutive due to net loss position	0	1	0	2
Total antidilutive shares	22	28	22	29