Pension - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Non-Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Market-related valuation of pension plan assets	3,800,000,000
Plan assets	4,186,000,000	$ 4,846,000,000	$ 4,623,000,000
Contributions to qualifed pension plans	2,000,000	$ 5,000,000
Plan assets invested in separate accounts of subsidiaries	4,000,000,000
Plan assets invested in funds offered by an unaffiliated insurance company	200,000,000
Pension Plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions to qualifed pension plans
Expected contributions to qualified pension plans in next fiscal year