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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | 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 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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