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Equity - Other share-based awards under the SIP (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Other share-based awards under the SIP |  |  |
Total share-based compensation expense included in net income | $ 21,000,000 | $ 26,000,000 | $ 28,000,000
Compensation Arrangement |  |  |
Other share-based awards under the SIP |  |  |
Amount of Directors' retainer paid in stock | $ 110,000 |  |
Percentage of additional Directors' retainer paid in stock | 50 |  |
Restricted Stock Units (RSUs) |  |  |
Other share-based awards under the SIP |  |  |
Total share-based compensation expense included in net income | $ 12,000,000 | 13,000,000 | 12,000,000
Restricted Stock Units (RSUs) | Compensation Arrangement |  |  |
Other share-based awards under the SIP |  |  |
Total share-based compensation expense included in net income | $ 1,000,000 | $ 1,000,000 | $ 1,000,000
Awards outstanding (in shares) | shares | 191 |  |
Carrying value of share units outstanding | $ 11,000,000 |  |

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