Variable Interest Entities - Investments in Qualified Affordable Housing Tax Credits (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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	57,000,000	42,000,000	100,000,000	77,000,000
Tax credits and other benefits	$ (66,000,000)	$ (50,000,000)	$ (117,000,000)	$ (91,000,000)