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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
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

Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Tax

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- Definition

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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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.

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Amount, before tax, of accumulated other comprehensive (income) loss for 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).

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