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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Table Text Block] | The following table sets forth the computation of basic and diluted earnings per share on net income (in millions, except per share information):
|  | 2020 |  | 2019 |  | 2018
Earnings: |  |  |  |  |  |
Net income (numerator for basic and diluted calculations) |  | $ | 415 |  |  | $ | 870 |  |  | $ | 716 |
Shares: |  |  |  |  |  |
Weighted average outstanding shares (denominator for basic calculations) |  | 65.4 |  |  | 62.7 |  |  | 63.7 |
Equivalent shares from outstanding stock awards |  | 0.4 |  |  | 1.2 |  |  | 1.4 |
Diluted shares (denominator for diluted calculations) |  | 65.8 |  |  | 63.9 |  |  | 65.1 |
Earnings per share: |  |  |  |  |  |
Basic |  | $ | 6.35 |  |  | $ | 13.88 |  |  | $ | 11.25 |
Diluted |  | 6.31 |  |  | 13.62 |  |  | 11.00 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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