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Benefit Plans - Postemployment Benefit Costs (Details) - Postemployment Benefit Plans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 2 $ 3 $ 3
Interest cost 1 1 2 2
Amortization of net gains 0 (1) (1) (2)
Net periodic benefit costs $ 2 $ 2 $ 4 $ 3