Variable Interest Entities - Investments in Qualified Affordable Housing Tax Credits (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Affordable Housing Investments
Variable Interest Entity [Line Items]
Impairment losses	$ 0	$ 0	$ 0	$ 0
Applicable income tax expense
Variable Interest Entity [Line Items]
Proportional amortization	47,000,000	53,000,000	148,000,000	130,000,000
Tax credits and other benefits	$ (60,000,000)	$ (58,000,000)	$ (178,000,000)	$ (149,000,000)