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v3.20.4

Share-based Compensation and Employee Benefits - Other Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Multiemployer Plans |  |  |
Amounts charged to expense | $ 6 | $ 8 | $ 8

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