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Benefit Plans - Components of Net Periodic Postretirement Health Care Costs (Details) - Postretirement Health Care Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 5	$ 5
Interest cost	8	12	15
Net loss/(gain)	2	7	6
Prior service credit	0	(30)	(38)
Net periodic postretirement health care costs/(benefit)	$ 14	$ (6)	$ (12)

X

- Definition

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

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