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Employee Benefit and Retirement Plans - Summary of Reconciliation of Change in Fair Value Measurement of Defined Benefit Plans' Consolidated Assets Using Significant Unobservable Inputs (Level 3) (Detail) - Level 3 - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Change in plan assets: |  |
Fair value of plan assets at beginning of year | $ 194 | $ 9
Unrealized losses |  | (101)
Purchases, sales, settlements and other, net | (184) | 286
Fair value of plan assets at end of year | $ 10 | $ 194

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases, Sales, Settlements and Other, Net + References No definition available. + Details
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- Definition Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, unrealized gains (losses). + References No definition available. + Details
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