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Pension And Other Retirement Benefits - Estimated Future Benefits Payments for Retirement Plans (Detail) - U.S. Plans
$ in Millions
Dec. 31, 2020
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 55
2022 17
2023 25
2024 21
2025 24
2026 - 2030 139
Other Retirement Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 1
2022 1
2023 2
2024 2
2025 2
2026 - 2030 $ 13