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Postretirement Plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss/(gain) | $ 17,976 | $ 18,175
Prior service credits | (922) | (1,143)
Total recognized in AOCI | 17,054 | 17,032
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss/(gain) | (1,534) | (1,852)
Prior service credits | (8) | (19)
Total recognized in AOCI | $ (1,542) | $ (1,871)

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) 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 -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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