Variable Interest Entities - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Assets	$ 213,765	$ 109,298
Liabilities	193,376	99,636
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	1,973	762
Variable Interest Entity, Not Primary Beneficiary | Total tax credit equity investments
Variable Interest Entity [Line Items]
Assets	1,810	603
Variable Interest Entity, Not Primary Beneficiary | Investment in qualified affordable housing projects
Variable Interest Entity [Line Items]
Assets	1,806	598
Variable Interest Entity, Not Primary Beneficiary | Other tax credit equity investments
Variable Interest Entity [Line Items]
Assets	4	5
Variable Interest Entity, Not Primary Beneficiary | Other unconsolidated investments
Variable Interest Entity [Line Items]
Assets	163	159
Variable Interest Entity, Not Primary Beneficiary | Commitments to tax credit investments
Variable Interest Entity [Line Items]
Liabilities	$ 901	$ 295