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Employee Benefit and Retirement Plans - Summary of Pension Plans with Accumulated Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Retirement Benefits [Abstract] |  |
Accumulated benefit obligation | $ 1,711 | $ 1,784
Fair value of plan assets | $ 1,380 | $ 1,435

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