Variable Interest Entities - Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Variable Interest Entity [Line Items]
Total revenue	$ 2,691	$ 2,959	$ 8,902	$ 8,993
Income tax expense	89	$ 159	381	$ 397
VIE - not primary beneficiary | Low Income Housing, Production and Investment Tax Credit Entities
Variable Interest Entity [Line Items]
Total revenue	8		23
Tax credits and benefits recognized in income tax expense	68		202
Proportional amortization recognized in income tax expense	(52)		(156)
Income tax expense	16		46
Net benefit attributable to tax-advantaged investments included in the consolidated statement of income	$ 24		$ 69