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Postretirement Benefit Plans - Accumulated Other Comprehensive Income (Loss) Related to Qualified Defined Benefit Pension and Retiree Medical and Life Insurance Plans (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Qualified Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial (losses) | $ (10,287) | $ (14,675)
Prior service credit (cost) | 339 | 884
Total | (9,948) | (13,791)
Estimated tax | 2,117 | 2,947
Net amount recognized in accumulated other comprehensive (loss) | (7,831) | (10,844)
Retiree Medical and Life Insurance Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial (losses) | 387 | 554
Prior service credit (cost) | (10) | (36)
Total | 377 | 518
Estimated tax | (79) | (110)
Net amount recognized in accumulated other comprehensive (loss) | $ 298 | $ 408

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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