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Benefit Plans - Postretirement Benefit Plans (Details) - Postretirement Benefit Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 3	$ 4
Interest cost	2	3	6	9
Net loss from experience differences	1	1	2	5
Prior service credit	0	(8)	0	(23)
Net periodic cost/(benefit)	$ 4	$ (3)	$ 11	$ (5)

X

- Definition

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

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