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Postretirement Benefit Plans - Plan Assets by Level Three Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 400 | $ 418 | $ 421
U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 248 | 264 | 280
Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,708 | 1,866 | $ 1,822
Other | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 257 | 418 |
Other | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 246 | 260 |
Other | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,190 | 1,707 |
Level 1 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 92 | 0 |
Level 1 | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2 | 4 |
Level 1 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 42 | 106 |
Level 2 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 51 | 0 |
Level 2 | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Level 2 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 476 | 53 |
Fixed income securities and cash equivalents | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 244 | 272 |
Fixed income securities and cash equivalents | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 198 | 210 |
Fixed income securities and cash equivalents | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,310 | 1,444 |
Fixed income securities and cash equivalents | Other | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 101 | 272 |
Fixed income securities and cash equivalents | Other | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 196 | 206 |
Fixed income securities and cash equivalents | Other | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 820 | 1,343 |
Fixed income securities and cash equivalents | Level 1 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 92 | 0 |
Fixed income securities and cash equivalents | Level 1 | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2 | 4 |
Fixed income securities and cash equivalents | Level 1 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 15 | 49 |
Fixed income securities and cash equivalents | Level 2 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 51 | 0 |
Fixed income securities and cash equivalents | Level 2 | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Fixed income securities and cash equivalents | Level 2 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 475 | 52 |
Equity securities | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 156 | 146 |
Equity securities | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 50 | 54 |
Equity securities | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 398 | 422 |
Equity securities | Other | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 156 | 146 |
Equity securities | Other | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 50 | 54 |
Equity securities | Other | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 370 | 364 |
Equity securities | Level 1 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Equity securities | Level 1 | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Equity securities | Level 1 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 27 | 57 |
Equity securities | Level 2 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Equity securities | Level 2 | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Equity securities | Level 2 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 1 | $ 1 |
[1] | Consists of bond index and equity index funds, measured at net asset value per share, as well as cash equivalents.

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