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Postretirement Benefit Plans - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 26, 2022 USD ($) retiree $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Sep. 26, 2021 USD ($) retiree
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Outstanding pension benefit obligations and related plan assets | $ 4,300 |  |  |  | $ 4,900
Non-cash, non-operating pension settlement charge | 1,500 | $ 1,500 | $ 1,700 |  |
Non-cash, non-operating pension settlement charge, after tax | $ 1,200 | $ 1,200 | $ 1,300 |  |
Non-cash, non-operating pension settlement charge, per share, after tax (in dollars per share) | $ / shares | $ 4.33 | $ 4.33 | $ 4.72 |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans |  | $ 24,884 | $ 37,361 |  |
Hedge funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans |  | $ 689 | 556 |  |
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] |  |  |  |  |
Gross benefit obligation |  | $ 1,000 | 1,300 |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans |  | 595 | 872 |  |
Net actuarial (losses) |  | 331 | 625 |  |
Benefit plan expense |  | 81 | 56 | $ 59 |
Qualified Defined Benefit Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation for defined benefit pension plans |  | 28,600 | 43,400 |  |
Actual return on plan assets |  | $ (5,923) | 3,899 |  |
Actual return on plan assets (percent) |  | (18.00%) |  |  |
Expected return on plan assets |  | $ 1,854 | 2,146 | 2,264 |
Gross benefit obligation |  | 28,698 | 43,447 | 51,352 |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans |  | 23,228 | 35,192 | $ 38,481 |
Net actuarial (losses) |  | $ (10,287) | $ (14,675) |  |
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 | retiree | 13,600 |  |  |  | 18,000

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