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Postretirement Benefit Plans - Plan Assets by Level Three Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 1,061 | $ 987 | $ 869
U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 389 | 356 | 330
Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 3,008 | 2,661 | $ 2,410
Other | U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,061 | 987 |
Other | U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 360 | 294 |
Other | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 2,748 | 2,433 |
Level 1 | U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Level 1 | U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 29 | 62 |
Level 1 | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 112 | 100 |
Level 2 | U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Level 2 | U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Level 2 | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 148 | 128 |
Fixed income securities and cash equivalents | U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 743 | 640 |
Fixed income securities and cash equivalents | U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 251 | 230 |
Fixed income securities and cash equivalents | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,278 | 1,947 |
Fixed income securities and cash equivalents | Other | U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 743 | 640 |
Fixed income securities and cash equivalents | Other | U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 222 | 168 |
Fixed income securities and cash equivalents | Other | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 2,063 | 1,762 |
Fixed income securities and cash equivalents | Level 1 | U.S. | Defined benefit plan |  |  |  |
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 plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 29 | 62 |
Fixed income securities and cash equivalents | Level 1 | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 69 | 59 |
Fixed income securities and cash equivalents | Level 2 | U.S. | Defined benefit plan |  |  |  |
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 plan |  |  |  |
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 plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 146 | 126 |
Equity securities | U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 318 | 347 |
Equity securities | U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 138 | 126 |
Equity securities | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 730 | 714 |
Equity securities | Other | U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 318 | 347 |
Equity securities | Other | U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 138 | 126 |
Equity securities | Other | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 685 | 671 |
Equity securities | Level 1 | U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Equity securities | Level 1 | U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Equity securities | Level 1 | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 43 | 41 |
Equity securities | Level 2 | U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Equity securities | Level 2 | U.S. | Retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Equity securities | Level 2 | Non-U.S. | Defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 2 | $ 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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