Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Variable Interest Entity [Line Items]
Other comprehensive income (loss), net of tax	$ 553	$ 1,687	$ 1,197	$ 794
Other investments	7,786		7,786		$ 7,252
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	$ 5,700		$ 5,700		$ 5,300