Variable Interest Entities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Total assets	$ 108,597	$ 58,309
Total liabilities	98,027	53,571
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total assets	717	169
Total liabilities	242	43
Maximum loss exposure	717	169
Variable Interest Entity, Not Primary Beneficiary | Tax credit equity investments
Variable Interest Entity [Line Items]
Total assets	539	157
Variable Interest Entity, Not Primary Beneficiary | Equity investments
Variable Interest Entity [Line Items]
Total assets	178	12
Variable Interest Entity, Not Primary Beneficiary | Commitments to tax credit investments
Variable Interest Entity [Line Items]
Total liabilities	$ 242	$ 43