Income per Share (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Antidilutive shares:
Basic weighted average common shares outstanding	892	881	875
Dilutive effect of awards granted under our stock incentive plans	0	0	0
Diluted weighted average common shares outstanding	892	881	875
Stock Options
Antidilutive shares:
Options with exercise price greater than the average market price	22	27	24
Options which are antidilutive due to net loss position	0	1	1
Total antidilutive shares	22	28	25