Benefit Plans - Obligations and Funded Status (Details) - Nonqualified plan - Pension plan - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Change in Benefit Obligation [Roll Forward]
Benefit obligation	$ 84	$ 82	$ 84
Interest cost	3	$ 3	2
Benefits paid	(6)		(6)
Actuarial (gains) losses on obligation	$ 5		(3)
Benefit obligation			78
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Accrued benefit cost			(78)	$ (84)
Accumulated other comprehensive income:
Prior service cost			0	0
Net amount recognized			$ (78)	$ (84)

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Amount, after tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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Defined Benefit Plan, Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]

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