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Employee Benefit Obligations - Other Post-Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Employee Benefit Obligations |  |
(Income) expense for net periodic benefit cost |  | $ 47
Forecast |  |
Employee Benefit Obligations |  |
(Income) expense for net periodic benefit cost | $ 49 |

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