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Long-Term Employee Benefit Liabilities - Long-Term Employee Benefit Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
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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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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Amount of liability, classified as noncurrent, for retirement benefits, classified as other.

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For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable after one year (or beyond the operating cycle if longer).

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