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Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Foreign Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | $ 199 | $ 188
Information for pension plans with an accumulated benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 218 | 197
Accumulated benefit obligation | 199 | 178
Fair value of plan assets | 112 | 114
Information for pension plans with a projected benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 218 | 224
Fair value of plan assets | 112 | 129
UNITED STATES |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 1,306 | 1,224
Information for pension plans with an accumulated benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 494 | 1,242
Accumulated benefit obligation | 481 | 1,224
Fair value of plan assets | 403 | 1,154
Information for pension plans with a projected benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 494 | 1,242
Fair value of plan assets | $ 403 | $ 1,154

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