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Benefit Plans (Expected Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Foreign Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected employer contribution in 2018 | $ 15
Expected benefit payments for fiscal year ending: |
2017 | 23
2018 | 23
2019 | 25
2020 | 26
2021 | 27
2023 - 2027 | 170
UNITED STATES |
Defined Benefit Plan Disclosure [Line Items] |
Expected employer contribution in 2018 | 39
Expected benefit payments for fiscal year ending: |
2017 | 71
2018 | 73
2019 | 74
2020 | 75
2021 | 76
2023 - 2027 | $ 380

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