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Equity - Other Share-based Awards under the SIP (Details) - USD ($) shares in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other share-based awards under the SIP |  |  |
Amount of Directors' retainer paid in stock | $ 160,000 |  |
Total share-based compensation expense included in net income | 37,000,000 | $ 33,000,000 | $ 29,000,000
RSUs | Director |  |  |
Other share-based awards under the SIP |  |  |
Total share-based compensation expense included in net income | $ 2,000,000 | $ 2,000,000 | $ 2,000,000
Awards outstanding (in shares) | 205 |  |
Carrying value of share units outstanding | $ 11,000,000 |  |
RSUs | Director | Minimum |  |  |
Other share-based awards under the SIP |  |  |
Minimum period over which deferred shares may be transferred after director's termination of service | 6 months |  |
RSUs | Director | Maximum |  |  |
Other share-based awards under the SIP |  |  |
Minimum period over which deferred shares may be transferred after director's termination of service | 10 years 6 months |  |

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