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Benefit Plans - Postretirement Benefit Plans (Details) - Postretirement Benefit Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 1	$ 3	$ 3
Interest cost	3	3	7	7
Net loss from experience differences	1	3	3	7
Prior service credit	(9)	(9)	(19)	(19)
Net periodic benefit costs	$ (3)	$ (2)	$ (6)	$ (2)

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

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