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Employee Benefit Plans - Schedule of Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Defined Pension Benefits  
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2016 $ 13
2017 12
2018 12
2019 12
2020 12
2021-2025 54
Other Postretirement Benefits  
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2016 3
2017 3
2018 3
2019 3
2020 3
2021-2025 $ 13