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Fair Value Measurements - Fair Value, Assets Measured on Nonrecurring Basis Using Unobservable Inputs (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring fair value losses | $ (34) | $ (12) | $ (46) | $ (112) | $ (98)
Fair Value, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 15 |  | 14 | 62 |
Nonrecurring fair value losses | (34) | (12) | (46) | (112) |
Investments | Fair Value, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value |  |  |  |  |
Nonrecurring fair value losses | (17) | (11) | (18) | (31) |
Operating lease equipment | Fair Value, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 15 |  |  | 47 |
Nonrecurring fair value losses | (5) |  |  | (7) |
Property, plant and equipment | Fair Value, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value |  |  | 14 |  |
Nonrecurring fair value losses | (9) |  | (26) | (19) |
Other Assets | Fair Value, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value |  |  |  | 15 |
Nonrecurring fair value losses | $ (3) | $ (1) | $ (2) | $ (55) |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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