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Benefit Plans (Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
UNITED STATES  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contribution in 2020 $ 8
Expected benefit payments for fiscal year ending:  
2017 71
2018 72
2019 73
2020 73
2021 73
2025 - 2029 365
Foreign Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contribution in 2020 8
Expected benefit payments for fiscal year ending:  
2017 15
2018 13
2019 14
2020 15
2021 17
2025 - 2029 $ 105