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Income (Loss) per Share (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Basic weighted average common shares outstanding (in shares) 876 877 874 876
Dilutive effect of awards granted under our stock incentive plans 0 1 1 3
Diluted weighted average common shares outstanding (in shares) 876 878 875 879
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options with exercise price greater than the average market price 26 15 23 7
Total antidilutive shares 26 15 23 7