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Postretirement Benefit Plans - Amounts Recognized in Other Comprehensive Income (Loss) Related to Postretirement Benefit Plans, Net of Tax (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | $ 342 | $ (684) | $ 2,022
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | (2) | (5) | (149)
Incurred but Not Yet Recognized in FAS Expense | 340 | (689) | 1,873
Actuarial gains and (losses) - Recognition of Previously Deferred Amounts | (188) | (116) | (1,493)
Net prior service credit and (cost) - Recognition of Previously Deferred Amounts | 112 | 265 | 268
Recognition of Previously Deferred Amounts | (76) | 149 | (1,225)
Qualified defined benefit pension plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | 211 | (698) | 1,952
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | (2) | (5) | (146)
Actuarial gains and (losses) - Recognition of Previously Deferred Amounts | (204) | (133) | (1,490)
Net prior service credit and (cost) - Recognition of Previously Deferred Amounts | 116 | 274 | 283
Retiree medical and life insurance plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | 108 | 47 | (95)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | 0 | (1) | (1)
Actuarial gains and (losses) - Recognition of Previously Deferred Amounts | 28 | 25 | 36
Net prior service credit and (cost) - Recognition of Previously Deferred Amounts | (3) | (8) | (22)
Other plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | 23 | (33) | 165
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost | 0 | 1 | (2)
Actuarial gains and (losses) - Recognition of Previously Deferred Amounts | (12) | (8) | (39)
Net prior service credit and (cost) - Recognition of Previously Deferred Amounts | $ (1) | $ (1) | $ 7

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- Definition Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Excluding Discontinued Operations, Net of Tax + References No definition available. + Details
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- Definition Amount, after tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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