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Pension Benefits Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Pension Plan, Postemployment Benefit Period 5 years    
Other Postretirement Benefits Payable $ 3   $ 3
Change in Accounting Method Accounted for as Change in Estimate | Scenario, Forecast      
Defined Benefit Plan Disclosure [Line Items]      
Expected impact of change in estimation of pension net periodic benefit cost   $ 10