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Postretirement Benefit Plans - Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in plan assets |  |  |
Beginning balance at fair value | $ 24,515 |  |
Settlements |  | $ (414) |
Ending balance at fair value | 24,092 | 24,515 |
Increased (decrease) in benefit obligation |  | 765 |
Settlement payments |  | 414 |
Qualified Defined Benefit Pension Plans |  |  |
Change in benefit obligation |  |  |
Beginning balance | 28,959 | 28,698 |
Service cost | 60 | 65 | $ 87
Interest cost | 1,398 | 1,459 | 1,289
Actuarial losses (gains) | (1,556) | 731 |
Settlements | 0 | (414) |
Plan amendments | 2 | 6 |
Benefits paid | (1,664) | (1,586) |
Medicare Part D subsidy | 0 | 0 |
Participants’ contributions | 0 | 0 |
Ending balance | 27,199 | 28,959 | 28,698
Change in plan assets |  |  |
Beginning balance at fair value | 22,800 | 23,228 |
Actual return on plan assets | 288 | 1,572 |
Settlements | 0 | (414) |
Benefits paid | (1,664) | (1,586) |
Company contributions | 990 | 0 |
Medicare Part D subsidy | 0 | 0 |
Participants’ contributions | 0 | 0 |
Ending balance at fair value | 22,414 | 22,800 | $ 23,228
Net (unfunded) funded status of the plans | $ (4,785) | $ (6,159) |
Weighted average discount rate | 5.625% | 5.00% | 5.25%
Increased (decrease) in benefit obligation | $ (1,800) |  |
Net losses due to changes in demographic data and assumptions | 250 |  |
Settlement payments | $ 0 | $ 414 |
Actual return on plan assets (percent) | 1.00% |  |
Retiree Medical and Life Insurance Plans |  |  |
Change in benefit obligation |  |  |
Beginning balance | $ 1,328 | 1,359 |
Service cost | 5 | 5 | $ 9
Interest cost | 63 | 68 | 49
Actuarial losses (gains) | (158) | 27 |
Settlements | 0 | 0 |
Plan amendments | 0 | 1 |
Benefits paid | (178) | (192) |
Medicare Part D subsidy | 2 | 1 |
Participants’ contributions | 52 | 59 |
Ending balance | 1,114 | 1,328 | 1,359
Change in plan assets |  |  |
Beginning balance at fair value | 1,715 | 1,656 |
Actual return on plan assets | 86 | 190 |
Settlements | 0 | 0 |
Benefits paid | (178) | (192) |
Company contributions | 1 | 1 |
Medicare Part D subsidy | 2 | 1 |
Participants’ contributions | 52 | 59 |
Ending balance at fair value | 1,678 | 1,715 | $ 1,656
Net (unfunded) funded status of the plans | $ 564 | $ 387 |
Weighted average discount rate | 5.50% | 5.00% | 5.25%
Settlement payments | $ 0 | $ 0 |
Actual return on plan assets (percent) | 1.00% | 7.00% |
Long-term rate of return assumption (percent) |  | 6.50% |

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- Definition Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before benefit payment, of receipt from prescription drug subsidy which increases benefit obligation of defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 + Details
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