Postretirement Benefit Plans - Additional Information (Detail) $ / shares in Units, satellite in Thousands, $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 03, 2021 USD ($) satellite	Dec. 31, 2014	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) retiree	Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Outstanding pension benefit obligations and related plan assets	$ 4,900
Non-cash, non-operating pension settlement charge			$ 1,700	$ 1,700
Non-cash, non-operating pension settlement charge, after tax			$ 1,300	$ 1,300
Non-cash, non-operating pension settlement charge, per share, after tax (in dollars per share) | $ / shares			$ 4.72	$ 4.72
Cash payment for contract					$ 1,400
Number of retirees | retiree					13,500
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans			$ 37,361	$ 37,361	$ 40,566
Equity method investments			$ 689	$ 689	$ 784
N.Y. Metropolitan Transportation Authority
Defined Benefit Plan Disclosure [Line Items]
Loss contingency, period of bench trial		35 days
F-35 Program | Net Sales | Product Concentration Risk | Aeronautics
Defined Benefit Plan Disclosure [Line Items]
Program Net Sales as Percent of Total Net Sales				27.00%	28.00%	27.00%
United Launch Alliance
Defined Benefit Plan Disclosure [Line Items]
Percentage of ownership interest in affiliated entity			50.00%	50.00%
Equity method investments			$ 585	$ 585	$ 691
Hedge funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period				1 month
Commingled equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period				90 days
Private equity funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period				8 years
Private equity funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period				12 years
Real estate funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period				8 years
Real estate funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period				10 years
Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation			1,300	$ 1,300	1,400
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans			872	872	877
Net actuarial losses			625	625	697
Benefit plan expense				56	59	$ 108
Qualified Defined  Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for defined benefit pension plans					51,300
Defined Benefit Plan, Benefit Obligation			43,447	43,447	51,352	48,674
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans			35,192	35,192	38,481	35,442
Net actuarial losses			$ 14,675	14,675	21,040
Actual return on plan assets				$ 3,899	5,594
Actual return on plan assets (percent)			10.50%	10.50%
Expected return on plan assets				$ 2,146	$ 2,264	$ 2,300
Expected long-term rate of return on assets				6.50%	7.00%	7.00%
Qualified Defined  Benefit Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	6.50%
Qualified Defined  Benefit Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	7.00%
Qualified Defined  Benefit Pension Plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Outstanding pension benefit obligations and related plan assets	$ 4,900
Number of retirees and beneficiaries | satellite	18
Irrevocable Group Annuity Contract
Defined Benefit Plan Disclosure [Line Items]
Cash payment for contract					$ 793
Irrevocable Group Annuity Contract | Qualified Defined  Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Number of retirees | retiree					2,500