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Restructuring Charges - Summary of Restructuring Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Accrued Restructuring Costs |  |  |  |  |
Restructuring charges | $ 33 | $ 72 | $ 85 | $ 189 |
NextGen Program |  |  |  |  |
Accrued Restructuring Costs |  |  |  |  |
Restructuring charges | 33 | 72 | 85 | 189 | $ 229
Employee separation costs |  |  |  |  |
Accrued Restructuring Costs |  |  |  |  |
Restructuring charges |  |  | 55 | 93 |
Employee separation costs | NextGen Program |  |  |  |  |
Accrued Restructuring Costs |  |  |  |  |
Restructuring charges | 29 | 15 | 55 | 93 |
Facility exit costs | NextGen Program |  |  |  |  |
Accrued Restructuring Costs |  |  |  |  |
Restructuring charges | 4 | 55 | 29 | 92 |
Accelerated depreciation | 4 | 17 | 11 | 27 |
Third party and other costs | NextGen Program |  |  |  |  |
Accrued Restructuring Costs |  |  |  |  |
Restructuring charges | $ 0 | $ 2 | $ 1 | $ 4 |

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