Variable Interest Entities - Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Variable Interest Entity [Line Items]
Total revenue	$ 3,110	$ 2,953	$ 6,211	$ 6,034
Income tax expense	$ 153	$ 88	292	$ 238
VIE - not primary beneficiary | Low Income Housing, Production and Investment Tax Credit Entities
Variable Interest Entity [Line Items]
Total revenue			15
Tax credits and benefits recognized in income tax expense			134
Proportional amortization recognized in income tax expense			(104)
Income tax expense			30
Net benefit attributable to tax-advantaged investments included in the consolidated statement of income			$ 45