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Benefit Plans (Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
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