Variable Interest Entities - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	$ 181,221,000,000		$ 186,346,000,000
VIE, liabilities	165,913,000,000		168,923,000,000
Recurring
Variable Interest Entity [Line Items]
Other investments	90,000,000		105,000,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	2,523,000,000		2,827,000,000
VIE, liabilities	1,000,000		1,000,000
Tax credit of investment		$ 47,000,000
Variable Interest Entity, Not Primary Beneficiary | Qualified affordable housing projects investment
Variable Interest Entity [Line Items]
VIE, liabilities	675,000,000		675,000,000
Variable Interest Entity, Not Primary Beneficiary | Other Unconsolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Other investments	2,200,000,000
Variable Interest Entity, Not Primary Beneficiary | Accrued Income And Other Assets
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	1,600,000,000		1,600,000,000
Variable Interest Entity, Not Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
Amortization of investment	46,000,000	$ 50,000,000
Tax credit of investment	45,000,000
Variable Interest Entity, Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	0		0
VIE, liabilities	0		0
Measured at NAV | Variable Interest Entity, Not Primary Beneficiary | Recurring | Principal Investments, Indirect
Variable Interest Entity [Line Items]
Other investments	$ 44,000,000		$ 45,000,000