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Postretirement Benefit Plans - Plan Assets by Level Three Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 421 | $ 934 | $ 1,061
U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 280 | 385 | 389
Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,822 | 2,813 | $ 3,008
Other | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 421 | 934 |
Other | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 273 | 375 |
Other | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,669 | 2,587 |
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 |  | 7 | 10 |
Level 1 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 92 | 120 |
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 |  | 61 | 106 |
Fixed income securities and cash equivalents | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 272 | 655 |
Fixed income securities and cash equivalents | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 182 | 248 |
Fixed income securities and cash equivalents | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,382 | 2,220 |
Fixed income securities and cash equivalents | Other | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 272 | 655 |
Fixed income securities and cash equivalents | Other | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 175 | 238 |
Fixed income securities and cash equivalents | Other | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,282 | 2,045 |
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 |  | 7 | 10 |
Fixed income securities and cash equivalents | Level 1 | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 40 | 71 |
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 |  | 60 | 104 |
Equity securities | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 149 | 279 |
Equity securities | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 98 | 137 |
Equity securities | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 440 | 593 |
Equity securities | Other | U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 149 | 279 |
Equity securities | Other | U.S. | Retiree Health Care |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 98 | 137 |
Equity securities | Other | Non-U.S. | Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 387 | 542 |
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 |  | 52 | 49 |
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 | $ 2 |
[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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