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Benefit Plans - Postretirement Benefit Plans (Details) - Postretirement Benefit Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 4	$ 4
Interest cost	3	4	9	11
Net loss from experience differences	1	2	5	5
Prior service credit	(8)	(10)	(23)	(29)
Net periodic benefit costs	$ (3)	$ (3)	$ (5)	$ (9)

X

- Definition

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

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