Benefit Plans - Schedule of Accrued Benefit Obligation Recorded in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Deferred income tax (expense) benefit	$ 22	$ 68
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	15	10	$ 15
Deferred income tax (expense) benefit	(3)	(2)	(4)
Accumulated other comprehensive income	12	8	$ 11
Postretirement Benefit Plan | Changes
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	5	(5)
Deferred income tax (expense) benefit	(1)	2
Accumulated other comprehensive income	$ 4	$ (3)