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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 |

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