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Retirement Benefits (Benefit Payments) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 $ 12
Other Postretirement Benefits (Gross, Before Medicare Part D) [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2017 26
2018 25
2019 23
2020 22
2021 19
2022-2026 39
Funded Plans [Member] | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 1
2018 1
2019 1
2020 1
2021 1
2022-2026 6
Unfunded Plans [Member] | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 7
2018 7
2019 6
2020 6
2021 5
2022-2026 $ 17