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Pensions and Post-Employment Benefits - Schedule of Estimated Payments for Pensions and Other Post-Employment Benefits (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Disclosure - Pensions and Post-Employment Benefits - Schedule of Estimated Payments for Pensions and Other Post-Employment Benefits [Abstract]
2021	$ 157
2022	144
2023	144
2024	144
2022 - 2030	$ 868

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- Definition

Disclosure - Pensions and Post-Employment Benefits - Schedule of Estimated Payments for Pensions and Other Post-Employment Benefits [Abstract]

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No definition available.

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- Definition

Estimated payments for pensions and other post employment benefits due in next twelve months.

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- Definition

Estimated payments for pensions and other post employment benefits due in year four.

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No definition available.

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- Definition

Estimated payments for pensions and other post employment benefits due in year three.

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No definition available.

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- Definition

Estimated payments for pensions and other post employment benefits due in year two.

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No definition available.

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- Definition

Estimated Payments For Pensions And Other Post employment Benefits Due In Years Five To Ten

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No definition available.

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