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Basis of Presentation - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) segment | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  | 3 |  |
Reinsurance revenues |  |  |  |  | $ 163 | $ 129 | $ 126
Reinsurance costs |  |  |  |  | 181 | 134 | 129
Research and development expense, net | $ 954 | $ 797 | $ 1,822 | $ 1,538 | 3,377 | 2,852 | 2,249
Accounts payable | $ 11,864 |  | $ 11,864 |  | $ 11,964 | 10,200 |
Capitalized Internal Use Software |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  | 5 years |  |
Minimum | Commercial Airplanes |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Standard warranty term |  |  |  |  | 3 years |  |
Minimum | Defense, Space & Security |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Standard warranty term |  |  |  |  | 6 months |  |
Minimum | Developed technology |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 4 years |  |
Minimum | Product know-how |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 6 years |  |
Minimum | Customer base |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 3 years |  |
Minimum | Distribution rights |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 3 years |  |
Minimum | Other Intangible Assets |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 1 year |  |
Minimum | Buildings and Land Improvements |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  | 10 years |  |
Minimum | Machinery and equipment |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  | 4 years |  |
Maximum | Commercial Airplanes |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Standard warranty term |  |  |  |  | 4 years |  |
Maximum | Defense, Space & Security |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Standard warranty term |  |  |  |  | 2 years |  |
Maximum | Developed technology |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 14 years |  |
Maximum | Product know-how |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 30 years |  |
Maximum | Customer base |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 17 years |  |
Maximum | Distribution rights |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 27 years |  |
Maximum | Other Intangible Assets |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite-lived acquired intangible assets, useful lives (in years) |  |  |  |  | 32 years |  |
Maximum | Buildings and Land Improvements |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  | 40 years |  |
Maximum | Machinery and equipment |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  | 20 years |  |
Maximum | 7372 Services, Prepackaged Software |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  | 10 years |  |
Bank Overdrafts |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Accounts payable |  |  |  |  | $ 117 | 102 |
Bid and Proposal Costs |  |  |  |  |  |  |
Schedule of Accounting Policies [Line Items] |  |  |  |  |  |  |
Research and development expense, net |  |  |  |  | $ 188 | $ 217 | $ 213

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