Pension - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Non-Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3,854,000,000	$ 4,138,000,000	$ 4,186,000,000
Contributions to qualifed pension plans	4,000,000	$ 0
Plan assets invested in separate accounts of subsidiaries	3,800,000,000
Plan assets invested in funds offered by an unaffiliated insurance company	100,000,000
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