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Postretirement Plans - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2020 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount by which fair value of plan assets exceeds market-related value of plan assets (MRVA) |  | $ (8,466) |  |
Derivative net notional amount for fixed income as percentage of total plan assets |  | 38.30% | 37.10% |
Derivative net notional amount for global equity, currency overlay and commodities as a percentage of total plan assets |  | 2.10% | (5.60%) |
Company contribution | $ 3,000 |  |  |
Defined contribution plan, cost |  | $ 1,564 | $ 1,260 | $ 1,268
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation (ABO) for all pension plans |  | 53,671 | 54,481 |
Company contribution |  |  | 2 |
Defined benefit plan, plan assets, amount |  | $ 48,891 | $ 49,825 | 67,813
Defined benefit plan, actual plan asset allocations |  | 100.00% | 100.00% |
Pension | Fixed income |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, actual plan asset allocations |  | 60.00% | 63.00% |
Pension | Equity securities: |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, actual plan asset allocations |  | 19.00% | 14.00% |
Pension | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, amount |  | $ 5,950 | $ 7,054 |
Pension | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, amount |  | 226 | 268 | 198
Pension | Boeing company stock | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, amount |  |  | 1,782 |
Pension | Corporate | Level 3 | Fixed income |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets Level 3 reconciliation, increase (decrease) for actual return (loss) on plan assets still held |  | 2 | (16) |
Pension | Mortgage backed and asset backed | Level 3 | Fixed income |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets Level 3 reconciliation, increase (decrease) for actual return (loss) on plan assets still held |  | 6 | (11) |
Pension | Other | Level 3 | Fixed income |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets Level 3 reconciliation, increase (decrease) for actual return (loss) on plan assets still held |  | 3 |  |
Pension | Municipal | Level 3 | Fixed income |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets Level 3 reconciliation, increase (decrease) for actual return (loss) on plan assets still held |  |  | (14) |
Pension | Real estate and real assets | Level 3 | Fixed income |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets Level 3 reconciliation, increase (decrease) for actual return (loss) on plan assets still held |  |  | (1) |
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, amount |  | $ 163 | $ 140 | $ 172
Other Postretirement Benefits | Fixed income |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, actual plan asset allocations |  | 40.00% |  |
Other Postretirement Benefits | Equity securities: |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, actual plan asset allocations |  | 60.00% |  |

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