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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Schedule of Computation of Basic and Diluted Earnings Per Share | The computation of basic and diluted earnings per share were as follows (dollars and shares in millions):
|  | 2023 |  |  | 2022 |  |  | 2021 |
Numerator: |  |  |  |  |  |  |  |  |
Basic and diluted: |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders |  | $ | 488 |  |  | $ | 423 |  |  | $ | 435 |
Denominator: |  |  |  |  |  |  |  |  |
Basic weighted average common stock |  |  | 85.0 |  |  |  | 87.1 |  |  |  | 87.5 |
Added: Weighted average stock options/share awards |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.2 |
Diluted weighted average common stock |  |  | 85.2 |  |  |  | 87.2 |  |  |  | 87.7 |
Net earnings per share - basic |  | $ | 5.74 |  |  | $ | 4.86 |  |  | $ | 4.97 |
Net earnings per share - diluted |  | $ | 5.72 |  |  | $ | 4.85 |  |  | $ | 4.96 |

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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