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Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Foreign Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | $ 376 | $ 433
Information for pension plans with an accumulated benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 89 | 109
Accumulated benefit obligation | 79 | 97
Fair value of plan assets | 33 | 33
Information for pension plans with a projected benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 220 | 238
Fair value of plan assets | 150 | 154
UNITED STATES |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 1,101 | 1,236
Information for pension plans with an accumulated benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 1,118 | 1,257
Accumulated benefit obligation | 1,101 | 1,236
Fair value of plan assets | 1,026 | 1,127
Information for pension plans with a projected benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 1,118 | 1,257
Fair value of plan assets | $ 1,026 | $ 1,127

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