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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
	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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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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