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Benefit Plans - Pension Plans Resulted in Net Pension Liability (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Prepaid pension assets | $ 672 | $ 516
Other current liabilities | (29) | (35)
Accrued pension costs | (1,257) | (1,190)
Net pension liability | (614) | (709)
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net pension liability | (614) | (709)
Pension Plans | U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 51 | 55
Accumulated benefit obligation | 51 | 55
Fair value of plan assets | 3 | 2
Pension Plans | Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 4,059 | 3,613
Accumulated benefit obligation | 3,873 | 3,447
Fair value of plan assets | $ 2,827 | $ 2,443

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