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Employee Benefits - Other Pre-tax Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension |  |  |
Reversal of amortization items |  |  |
Prior service cost (benefit) | $ (112) | $ (82) | $ (61)
Total recognized in Other comprehensive loss (income) (pre-tax) | (112) | (82) | (61)
Health Care and Life |  |  |
Reversal of amortization items |  |  |
Prior service cost (benefit) | 419 | 530 | 894
Total recognized in Other comprehensive loss (income) (pre-tax) | $ 419 | $ 530 | $ 894

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