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Earnings Per Share (Notes) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |
Earnings Per Share [Text Block] | Basic earnings per share are based on the weighted average number of shares of common stock outstanding. Diluted earnings per share are based upon the weighted average number of shares of common stock outstanding plus all potentially dilutive securities that were assumed to be converted into common shares at the beginning of the period under the treasury stock method. This method requires that the effect of potentially dilutive common stock equivalents (stock options, SSARs, restricted stock or units, and performance stock units) be excluded from the calculation of diluted earnings per share for the periods in which losses from continuing operations are reported because the effect is anti-dilutive. The following table sets forth the computation of basic and diluted earnings per share:
| Year ended December 31,
Share amounts in millions | 2020 |  | 2019 |  | 2018
Denominator for basic earnings per share: |  |  |  |  |
Weighted average common shares outstanding | 111 |  |  | 123 |  |  | 143 |
Effect of dilutive securities: |  |  |  |  |
Dilutive effect of employee stock plans | 1 |  |  | — |  |  | 1 |
Dilutive potential common shares | 112 |  |  | 123 |  |  | 144 |
Denominator for diluted earnings per share: |  |  |  |  |
Adjusted weighted average shares | 112 |  |  | 123 |  |  | 144 |
For the year ended December 31, 2019, approximately one million of the outstanding restricted stock and shares of common stock issuable upon exercise of outstanding stock option awards have been excluded from the calculation of diluted earnings per share because the net loss for the year ended December 31, 2019, causes such securities to be anti-dilutive.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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