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Postretirement Benefit Plans - Plan Assets by Level Three Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 418 | $ 421 | $ 934
U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 264 | 280 | 385
Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,866 | 1,822 | $ 2,813
Other | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 418 | 421 |
Other | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 260 | 273 |
Other | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,707 | 1,669 |
Level 1 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Level 1 | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 4 | 7 |
Level 1 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 106 | 92 |
Level 2 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 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 |  | 53 | 61 |
Fixed income securities and cash equivalents | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 272 | 272 |
Fixed income securities and cash equivalents | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 210 | 182 |
Fixed income securities and cash equivalents | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,444 | 1,382 |
Fixed income securities and cash equivalents | Other | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 272 | 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] | 206 | 175 |
Fixed income securities and cash equivalents | Other | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,343 | 1,282 |
Fixed income securities and cash equivalents | Level 1 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 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 |  | 4 | 7 |
Fixed income securities and cash equivalents | Level 1 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 49 | 40 |
Fixed income securities and cash equivalents | Level 2 | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 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 |  | 52 | 60 |
Equity securities | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 146 | 149 |
Equity securities | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 54 | 98 |
Equity securities | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 422 | 440 |
Equity securities | Other | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 146 | 149 |
Equity securities | Other | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 54 | 98 |
Equity securities | Other | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 364 | 387 |
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 |  | 57 | 52 |
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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