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Variable Interest Entities - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	$ 176,203,000,000		$ 170,336,000,000
VIE, liabilities	158,569,000,000		152,355,000,000
Recurring
Variable Interest Entity [Line Items]
Other investments	88,000,000		81,000,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	364,000,000		351,000,000
VIE, liabilities	1,000,000		1,000,000
Tax credit of investment		$ 46,000,000
Variable Interest Entity, Not Primary Beneficiary | Qualified affordable housing projects investment
Variable Interest Entity [Line Items]
VIE, liabilities	463,000,000		484,000,000
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	1,400,000,000		1,400,000,000
Variable Interest Entity, Not Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
Amortization of investment	50,000,000	$ 49,000,000
Tax credit of investment	47,000,000
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	$ 51,000,000		$ 53,000,000

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The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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