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Stock Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Award Activity [Table Text Block] | Award activity — (shares in millions)
|  | Options |  | SARs |  | RSUs |  | PSUs
|  | Shares |  | Exercise Price per Share* |  | Shares |  | Exercise Price per Share* |  | Shares |  | Grant-Date Fair Value per Share* |  | Shares |  | Grant-Date Fair Value per Share*
December 31, 2016 |  | 1.5 |  |  | $ | 14.56 |  |  | 0.3 |  |  | $ | 15.42 |  |  | 1.8 |  |  | $ | 16.54 |  |  | 0.6 |  |  | $ | 16.31 |
Granted |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.8 |  |  | 19.92 |  |  | 0.3 |  |  | 18.63 |
Exercised or vested |  | (0.7 | ) |  | 14.54 |  |  | (0.2 | ) |  | 15.62 |  |  | (0.6 | ) |  | 18.48 |  |  | (0.2 | ) |  | 21.68 |
Forfeited or expired |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.2 | ) |  | 17.09 |  |  | (0.1 | ) |  | 20.36 |
December 31, 2017 |  | 0.8 |  |  | 14.58 |  |  | 0.1 |  |  | 14.83 |  |  | 1.8 |  |  | 17.38 |  |  | 0.6 |  |  | 15.70 |
* Weighted-average
Total Stock Compensation Expense and Other Annual Disclosures [Table Text Block] |
| 2017 |  | 2016 |  | 2015
Total stock compensation expense | $ | 23 |  |  | $ | 17 |  |  | $ | 14 |
Total grant-date fair value of awards vested | 17 |  |  | 11 |  |  | 21 |
Cash received from exercise of stock options | 10 |  |  | 2 |  |  | 2 |
Cash paid to settle SARs and RSUs | 4 |  |  | 1 |  |  | 2 |
Intrinsic value of stock options and SARs exercised | 8 |  |  | 1 |  |  | 1 |
Intrinsic value of RSUs and PSUs vested | 20 |  |  | 7 |  |  | 16 |
Key Assumptions as Part of Monte Carlo Simulation Model [Table Text Block] | For the portion of the PSU award based on shareholder returns, we estimated the fair value at grant date using various assumptions as part of a Monte Carlo simulation. The expected term represents the period from the grant date to the end of the performance period. The risk-free interest rate was based on U.S. Treasury constant maturity rates at the grant date. The dividend yield was calculated by dividing the expected annual dividend by the average stock price over the prior year. The expected volatility was based on historical volatility using daily stock price observations.
| PSUs
| 2016 |  | 2015
Expected term (in years) | 3.0 |  |  | 3.0 |
Risk-free interest rate | 1.00 | % |  | 0.89 | %
Dividend yield | 1.40 | % |  | 0.98 | %
Expected volatility | 33.4 | % |  | 33.9 | %

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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