Income (Loss) per Share (Details) - shares shares in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Basic weighted average common shares outstanding (in shares) | 872 | 862 | 869 | 860 |
| Dilutive effect of awards granted under our stock incentive plans | 1 | 2 | 3 | 0 |
| Diluted weighted average common shares outstanding (in shares) | 873 | 864 | 872 | 860 |
| Stock Options [Member] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Options with exercise price greater than the average market price | 14 | 12 | 6 | 13 |
| Options which are antidilutive due to net loss position | 0 | 0 | 0 | 1 |
| Total antidilutive shares | 14 | 12 | 6 | 14 |