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Schedule of Stockholders Equity (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Common Stock, Shares, Outstanding beginning of period | 88,946,704 |
Issuance of shares pursuant to equity-based plans | $ 1 | $ 1
Adjustments Related to Tax Withholding for Share-based Compensation | 1 | 1
Stockholders' Equity | 2,344 | 2,258
Dividends declared | (59) | (55)
Net Income | $ 105 | 98
Common Stock, Shares, Outstanding end of period | 89,062,560 |
Stockholders' Equity | $ 2,392 | $ 2,303
Common Stock [Member] |  |
Common Stock, Shares, Outstanding beginning of period | 88,946,704 | 88,792,751
Issuances of shares pursuant to equity-based plans | 115,856 | 128,005
Common Stock, Shares, Outstanding end of period | 89,062,560 | 88,920,756
Common Stock Including Additional Paid in Capital [Member] |  |
Issuance of shares pursuant to equity-based plans | $ 1 | $ 1
Adjustments Related to Tax Withholding for Share-based Compensation | 1 | 1
Stockholders' Equity | 1,201 | 1,196
Dividends declared | 0 | 0
Stockholders' Equity | 1,203 | 1,198
AOCI Attributable to Parent [Member] |  |
Stockholders' Equity | (7) | (8)
Stock-based compensation | 0 | 0
Dividends declared | 0 | 0
Stockholders' Equity | (7) | (8)
Retained Earnings [Member] |  |
Stockholders' Equity | 1,150 | 1,070
Stock-based compensation | 0 | 0
Dividends declared | (59) | (55)
Net Income | 105 | 98
Stockholders' Equity | $ 1,196 | $ 1,113

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