| Reconciliation of GAAP Operating Income (loss) to Non-GAAP Operating Income | ||||||||||||||||||||
| (Millions) | Q4-17 | Q3-17 | Q4-16 | 2017 | 2016 | |||||||||||||||
| GAAP operating income (loss) | $ | 82 | $ | 126 | $ | (3 | ) | $ | 204 | $ | (372 | ) | ||||||||
| Stock-based compensation | 21 | 29 | 29 | 97 | 86 | |||||||||||||||
| Charge related to the sixth amendment to the WSA with GF | — | — | — | — | 340 | |||||||||||||||
| Restructuring and other special charges, net | — | — | — | — | (10 | ) | ||||||||||||||
| Non-GAAP operating income | $ | 103 | $ | 155 | $ | 26 | $ | 301 | $ | 44 | ||||||||||
| Reconciliation of GAAP to Non-GAAP Net Income (Loss)/Earnings (Loss) per Share | ||||||||||||||||||||||||||||||||||||||||
| (Millions except per share amounts) | Q4-17 | Q3-17 | Q4-16 | 2017 | 2016 | |||||||||||||||||||||||||||||||||||
| GAAP net income (loss) / earnings (loss) per share | $ | 61 | $ | 0.06 | $ | 71 | $ | 0.07 | $ | (51 | ) | $ | (0.06 | ) | $ | 43 | $ | 0.04 | $ | (497 | ) | $ | (0.60 | ) | ||||||||||||||||
| Charge related to the sixth amendment to the WSA with GF | — | — | — | — | — | — | — | — | 340 | 0.41 | ||||||||||||||||||||||||||||||
| Stock-based compensation | 21 | 0.02 | 29 | 0.02 | 29 | 0.03 | 97 | 0.09 | 86 | 0.10 | ||||||||||||||||||||||||||||||
| Restructuring and other special charges, net | — | — | — | — | — | — | — | — | (10 | ) | (0.01 | ) | ||||||||||||||||||||||||||||
| Loss on debt redemption | 3 | — | 2 | — | 7 | 0.01 | 12 | 0.01 | 68 | 0.08 | ||||||||||||||||||||||||||||||
| Non-cash interest expense related to convertible debt | 5 | — | 6 | 0.01 | 5 | 0.01 | 22 | 0.02 | 6 | 0.01 | ||||||||||||||||||||||||||||||
| Gain on sale of 85% of ATMP JV | (3 | ) | — | — | — | — | — | (3 | ) | — | (146 | ) | (0.17 | ) | ||||||||||||||||||||||||||
| Tax provision related to sale of 85% of ATMP JV | 1 | — | — | — | — | — | 1 | — | 26 | 0.03 | ||||||||||||||||||||||||||||||
| Equity loss in investee | — | — | 2 | — | 2 | — | 7 | 0.01 | 10 | 0.01 | ||||||||||||||||||||||||||||||
| Non-GAAP net income (loss) / earnings (loss) per share | $ | 88 | $ | 0.08 | $ | 110 | $ | 0.10 | $ | (8 | ) | $ | (0.01 | ) | $ | 179 | $ | 0.17 | $ | (117 | ) | $ | (0.14 | ) | ||||||||||||||||
| Q4 and Q3 2017 GAAP diluted earnings per share (EPS) are calculated based on 1,037 million and 1,042 million shares, respectively. Q4 and Q3 2017 non-GAAP diluted EPS are calculated based on 1,137 million and 1,143 million shares, respectively, which include 100.6 million shares related to the Company’s 2026 Convertible Notes and a $5 million cash interest expense add-back to net income under the "if converted" method.
2017 GAAP and non-GAAP diluted EPS are both calculated based on 1,039 million shares. | ||||||||||||||||||||||||||||||||||||||||
