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Employee Benefit Plans - Future Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2015
USD ($)
U. S. Pension Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2016 $ 11
2017 11
2018 12
2019 13
2020 13
2021-2025 71
U. S. Postretirement Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2016 1
2017 1
2018 1
2019 1
2020 1
2021-2025 $ 3