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Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Schedule of Stockholders Equity [Table Text Block] | The activity in equity during the three-month periods ended March 31, 2021 and 2020 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, 2020 | 89,537,331 |  |  | $ | 1,231 |  |  | $ | (11) |  |  | $ | 1,393 |  |  | $ | 2,613 |  |  |  |
Issuances of shares pursuant to equity-based plans | 39,417 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |
Stock-based compensation | — |  |  | 2 |  |  | — |  |  | — |  |  | 2 |  |  |  |
Dividends declared ($0.4075 per share) | — |  |  | — |  |  | — |  |  | (36) |  |  | (36) |  |  |  |
Net income | — |  |  | — |  |  | — |  |  | 96 |  |  | 96 |  |  |  |
Balances as of March 31, 2021 | 89,576,748 |  |  | $ | 1,233 |  |  | $ | (11) |  |  | $ | 1,453 |  |  | $ | 2,675 |  |  |  |
Balances as of December 31, 2019 | 89,387,124 |  |  | $ | 1,220 |  |  | $ | (10) |  |  | $ | 1,381 |  |  | $ | 2,591 |  |  |  |
Issuances of shares pursuant to equity-based plans | 77,397 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |
Other comprehensive income | — |  |  | — |  |  | 1 |  |  | — |  |  | 1 |  |  |  |
Dividends declared ($0.3850 per share) | — |  |  | — |  |  | — |  |  | (35) |  |  | (35) |  |  |  |
Net income | — |  |  | — |  |  | — |  |  | 81 |  |  | 81 |  |  |  |
Balances as of March 31, 2020 | 89,464,521 |  |  | $ | 1,220 |  |  | $ | (9) |  |  | $ | 1,427 |  |  | $ | 2,638 |  |  |  |

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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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