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Employee Benefit Plans - Schedule of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Pension Benefits  
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity  
2017 $ 1,154
2018 1,163
2019 1,184
2020 1,206
2021 1,224
2022-2026 6,326
Other Postretirement and Postemployment Benefits  
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity  
2017 281
2018 286
2019 284
2020 285
2021 287
2022-2026 $ 1,443