Variable Interest Entities - Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	$ 195,037,000,000		$ 189,813,000,000
VIE, liabilities	181,193,000,000		176,359,000,000
Recurring
Variable Interest Entity [Line Items]
Other investments	59,000,000		77,000,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	1,450,000,000		1,798,000,000
VIE, liabilities	1,000,000		1,000,000
Tax credit of investment		$ 91,000,000
Variable Interest Entity, Not Primary Beneficiary | Qualified Affordable Housing Projects Investment | LIHTC
Variable Interest Entity [Line Items]
VIE, liabilities	1,200,000,000		957,000,000
Variable Interest Entity, Not Primary Beneficiary | Other Unconsolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Other investments	1,000,000,000
Variable Interest Entity, Not Primary Beneficiary | Accrued Income And Other Assets | LIHTC
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	2,200,000,000		1,900,000,000
Variable Interest Entity, Not Primary Beneficiary | Accrued Income And Other Assets | NMTC
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	31,000,000		12,000,000
Variable Interest Entity, Not Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
Amortization of investment	107,000,000	93,000,000
Tax credit of investment	104,000,000
Other tax benefits	26,000,000	$ 22,000,000
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	$ 18,000,000		$ 34,000,000