Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Variable Interest Entity [Line Items]
Other comprehensive income (loss), net of tax	$ 1,687	$ (3,376)	$ 794	$ (2,128)
Other investments	5,743		5,743		$ 5,015
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	$ 5,000		$ 5,000		$ 4,200