Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Variable Interest Entity [Line Items]
Other comprehensive income (loss), net of tax	$ (86)	$ (418)	$ 644	$ (893)
Other investments	6,611		6,611		$ 6,588
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Other comprehensive income (loss), net of tax	0	$ 0	0	$ 0
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Other investments	$ 5,600		$ 5,600		$ 5,300