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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5	$ 5	$ 6
Interest cost	12	15	14
Net loss/(gain)	7	6	15
Prior service credit	(30)	(38)	(39)
Net periodic postretirement health care costs/(benefit)	$ (6)	$ (12)	$ (4)

X

- Definition

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

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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