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Postretirement Benefit Plans - Additional Information (Detail) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans	$ 24,092,000,000	$ 24,515,000,000
Contributions made to defined contribution plans	$ 1,200,000,000	$ 1,200,000,000
Shares of our stock held in defined contribution plans we sponsor (in shares)	24.9	26.6
Nonqualified Defined Benefit Pension Plans and Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Gross benefit obligation	$ 905,000,000	$ 1,000,000,000
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans	658,000,000	615,000,000
Net actuarial (losses) gains	(303,000,000)	(347,000,000)
Benefit plan expense	62,000,000	64,000,000	$ 81,000,000
Qualified Defined  Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Cash contributions	990,000,000
Expected required contributions to our qualified defined benefit pension plans in next fiscal year	0
Gross benefit obligation	27,199,000,000	28,959,000,000	28,698,000,000
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans	22,414,000,000	22,800,000,000	$ 23,228,000,000
Net actuarial (losses) gains	10,469,000,000	10,999,000,000
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans	$ 1,028,000,000	$ 847,000,000
Minimum | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period	1 month
Commingled equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period	90 days
Private equity funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period	8 years
Private equity funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period	12 years
Real estate funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period	8 years
Real estate funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period	10 years

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