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Benefit Plans - Schedule of Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Qualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 114
2019 125
2020 137
2021 150
2022 164
2023-2027 1,042
Nonqualified Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 15
2019 15
2020 16
2021 16
2022 17
2023-2027 $ 101