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Long-Term Employee Benefit Liabilities - Long-Term Employee Benefit Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Retirement Benefits [Abstract] |  |
Defined benefit pension plans and other | $ 216 | $ 203
Termination and long-term service arrangements | 468 | 437
Retirement medical benefits plans | 29 | 27
Other long-term employee benefits | 16 | 10
Long-term employee benefit obligations | $ 729 | $ 677

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