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Restructuring and Other Related Charges (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) employee | Sep. 30, 2020 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | $ 5 | $ 17 | $ 47 | $ 89
Number of positions eliminated | employee |  |  | 120 |
Voluntary termination | Limited Voluntary Opportunity Plan (“LVOP”) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses |  |  | $ 17 | 18
John F. North |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Labor and Related Expense |  | $ 3 |  |
Michael K. Tucker |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Other nonrecurring expense |  |  |  | $ 2

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