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Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Equity [Abstract] |
Schedule of Stockholders Equity [Table Text Block] | The activity in equity during the three and six-month periods ended June 30, 2019 and 2018 was as follows (dollars in millions, except per share amounts):
| Common Stock |  | Accumulated Other Comprehensive Loss |  | Retained Earnings |  |
| Shares |  | Amount |  |  |  | Total
Balances as of December 31, 2018 | 89,267,959 |  |  | $ | 1,212 |  |  | $ | (7 | ) |  | $ | 1,301 |  |  | $ | 2,506 |
Issuances of shares pursuant to equity-based plans | 88,352 |  |  | — |  |  | — |  |  | — |  |  | — |
Other comprehensive income | — |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Dividends declared ($0.3625 per share) | — |  |  | — |  |  | — |  |  | (32 | ) |  | (32 | )
Net income | — |  |  | — |  |  | — |  |  | 73 |  |  | 73 |
Reclassification of stranded tax effects due to Tax Reform | — |  |  | — |  |  | (2 | ) |  | 2 |  |  | — |
Balances as of March 31, 2019 | 89,356,311 |  |  | $ | 1,212 |  |  | $ | (8 | ) |  | $ | 1,344 |  |  | $ | 2,548 |
Issuances of shares pursuant to equity-based plans | 15,249 |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Stock-based compensation | — |  |  | 2 |  |  | — |  |  | — |  |  | 2 |
Other comprehensive income | — |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Dividends declared ($0.3850 per share) | — |  |  | — |  |  | — |  |  | (35 | ) |  | (35 | )
Net income | — |  |  | — |  |  | — |  |  | 25 |  |  | 25 |
Balances as of June 30, 2019 | 89,371,560 |  |  | $ | 1,215 |  |  | $ | (7 | ) |  | $ | 1,334 |  |  | $ | 2,542 |
Balances as of December 31, 2017 | 89,114,265 |  |  | $ | 1,207 |  |  | $ | (8 | ) |  | $ | 1,217 |  |  | $ | 2,416 |
Issuances of shares pursuant to equity-based plans | 99,854 |  |  | — |  |  | — |  |  | — |  |  | — |
Stock-based compensation | — |  |  | (1 | ) |  | — |  |  | — |  |  | (1 | )
Dividends declared ($0.3400 per share) | — |  |  | — |  |  | — |  |  | (30 | ) |  | (30 | )
Net income | — |  |  | — |  |  | — |  |  | 64 |  |  | 64 |
Balances as of March 31, 2018 | 89,214,119 |  |  | $ | 1,206 |  |  | $ | (8 | ) |  | $ | 1,251 |  |  | $ | 2,449 |
Issuances of shares pursuant to equity-based plans | 24,087 |  |  | — |  |  | — |  |  | — |  |  | — |
Stock-based compensation | — |  |  | 2 |  |  | — |  |  | — |  |  | 2 |
Dividends declared ($0.3625 per share) | — |  |  | — |  |  | — |  |  | (32 | ) |  | (32 | )
Net income | — |  |  | — |  |  | — |  |  | 46 |  |  | 46 |
Balances as of June 30, 2018 | 89,238,206 |  |  | $ | 1,208 |  |  | $ | (8 | ) |  | $ | 1,265 |  |  | $ | 2,465 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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