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Benefit Plans - Postemployment Benefit Costs (Details) - Postemployment Benefit Plans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 4 $ 4
Interest cost 2 1 4 3
Amortization of net gains (1) (1) (2) (3)
Net periodic benefit costs $ 2 $ 1 $ 6 $ 4