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Pensions Benefit Plans and Other Postretirement Benefits - U.S. Plan Assets By Hierarchy (Details) - Pension Benefit Plans - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Minimum |  |  |
Defined Benefit Plan Disclosure |  |  |
Percentage of pension plan assets | 10.00% |  |
U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 1,324 | $ 1,215 | $ 1,094
Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 929 | 947 | $ 843
Cash and cash equivalents | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 31 | 8 |
Equity securities | U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Percentage of pension plan assets | 66.00% |  |
Equity securities | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Percentage of pension plan assets | 20.00% |  |
Debt securities | U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Percentage of pension plan assets | 29.00% |  |
Debt securities | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 38 | 58 |
Percentage of pension plan assets | 57.00% |  |
Other | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 26 | 23 |
Real estate and other | U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Percentage of pension plan assets | 5.00% |  |
Real estate and other | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Percentage of pension plan assets | 23.00% |  |
Level 1 | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 67 | 63 |
Level 1 | Cash and cash equivalents | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 31 | 8 |
Level 1 | Debt securities | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 36 | 55 |
Level 2 | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 28 | 26 |
Level 2 | Debt securities | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 2 | 3 |
Level 2 | Other | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 26 | 23 |
Fair Value Measured at Net Asset Value | Non-U.S. | Funded Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 834 | $ 858 |

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