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Schedule of Stockholders Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Common Stock, Shares, Outstanding beginning of period |  |  | 89,114,265 |
Issuance of shares pursuant to equity-based plans |  |  | $ 0 | $ 1
Adjustments Related to Tax Withholding for Share-based Compensation |  |  | 1 | 1
Stockholders' Equity |  |  | 2,416 | 2,344
Dividends declared |  |  | (62) | (59)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 46 | $ 32 | 110 | 105
Net Income |  |  | $ 110 | 105
Common Stock, Shares, Outstanding end of period | 89,238,206 |  | 89,238,206 |
Stockholders' Equity | $ 2,465 | $ 2,392 | $ 2,465 | $ 2,392
Common Stock [Member] |  |  |  |
Common Stock, Shares, Outstanding beginning of period |  |  | 89,114,265 | 88,946,704
Issuances of shares pursuant to equity-based plans |  |  | 123,941 | 115,856
Common Stock, Shares, Outstanding end of period | 89,238,206 | 89,062,560 | 89,238,206 | 89,062,560
Common Stock Including Additional Paid in Capital [Member] |  |  |  |
Issuance of shares pursuant to equity-based plans |  |  | $ 0 | $ 1
Adjustments Related to Tax Withholding for Share-based Compensation |  |  | (1) | (1)
Stockholders' Equity |  |  | 1,207 | 1,201
Dividends declared |  |  | 0 | 0
Stockholders' Equity | $ 1,208 | $ 1,203 | 1,208 | 1,203
AOCI Attributable to Parent [Member] |  |  |  |
Stockholders' Equity |  |  | (8) | (7)
Stock-based compensation |  |  | 0 | 0
Dividends declared |  |  | 0 | 0
Stockholders' Equity | (8) | (7) | (8) | (7)
Retained Earnings [Member] |  |  |  |
Stockholders' Equity |  |  | 1,217 | 1,150
Stock-based compensation |  |  | 0 | 0
Dividends declared |  |  | (62) | (59)
Net Income |  |  |  | 105
Stockholders' Equity | $ 1,265 | $ 1,196 | $ 1,265 | $ 1,196

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