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Equity (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Schedule of Stockholders Equity [Table Text Block] | The activity in equity during the nine months ended September 30, 2017 and 2016 is as follows (dollars in millions):
| Common Stock |  | Accumulated Other Comprehensive Loss |  | Retained Earnings |  |
| Shares |  | Amount |  |  |  | Total
Balances as of December 31, 2016 | 88,946,704 |  |  | $ | 1,201 |  |  | $ | (7 | ) |  | $ | 1,150 |  |  | $ | 2,344 |
Issuances of shares pursuant to equity-based plans | 145,251 |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Stock-based compensation | — |  |  | 2 |  |  | — |  |  | — |  |  | 2 |
Dividends declared | — |  |  | — |  |  | — |  |  | (90 | ) |  | (90 | )
Net income | — |  |  | — |  |  | — |  |  | 145 |  |  | 145 |
Balances as of September 30, 2017 | 89,091,955 |  |  | $ | 1,204 |  |  | $ | (7 | ) |  | $ | 1,205 |  |  | $ | 2,402 |
Balances as of December 31, 2015 | 88,792,751 |  |  | $ | 1,196 |  |  | $ | (8 | ) |  | $ | 1,070 |  |  | $ | 2,258 |
Issuances of shares pursuant to equity-based plans | 133,875 |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Stock-based compensation | — |  |  | 2 |  |  | — |  |  | — |  |  | 2 |
Dividends declared | — |  |  | — |  |  | — |  |  | (84 | ) |  | (84 | )
Other comprehensive income |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income | — |  |  | — |  |  | — |  |  | 132 |  |  | 132 |
Balances as of September 30, 2016 | 88,926,626 |  |  | $ | 1,199 |  |  | $ | (7 | ) |  | $ | 1,118 |  |  | $ | 2,310 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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