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Equity (Notes) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Equity | EQUITY The activity in equity during the six-month periods ended June 30, 2018 and 2017 is as follows (dollars in millions):
| Common Stock |  | Accumulated Other Comprehensive Loss |  | Retained Earnings |  |
| Shares |  | Amount |  |  |  | Total
Balances as of December 31, 2017 | 89,114,265 |  |  | $ | 1,207 |  |  | $ | (8 | ) |  | $ | 1,217 |  |  | $ | 2,416 |
Issuances of shares pursuant to equity-based plans | 123,941 |  |  | — |  |  | — |  |  | — |  |  | — |
Stock-based compensation | — |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Dividends declared | — |  |  | — |  |  | — |  |  | (62 | ) |  | (62 | )
Net income | — |  |  | — |  |  | — |  |  | 110 |  |  | 110 |
Balances as of June 30, 2018 | 89,238,206 |  |  | $ | 1,208 |  |  | $ | (8 | ) |  | $ | 1,265 |  |  | $ | 2,465 |
Balances as of December 31, 2016 | 88,946,704 |  |  | $ | 1,201 |  |  | $ | (7 | ) |  | $ | 1,150 |  |  | $ | 2,344 |
Issuances of shares pursuant to equity-based plans | 115,856 |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Stock-based compensation | — |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Dividends declared | — |  |  | — |  |  | — |  |  | (59 | ) |  | (59 | )
Net income | — |  |  | — |  |  | — |  |  | 105 |  |  | 105 |
Balances as of June 30, 2017 | 89,062,560 |  |  | $ | 1,203 |  |  | $ | (7 | ) |  | $ | 1,196 |  |  | $ | 2,392 |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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