Variable Interest Entities and Securitizations - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Amortization method qualified affordable housing investments, amortization	$ 682	$ 637
Affordable housing tax credits	721	664
Amortization method qualified affordable housing investments	5,500	4,900
Qualified affordable housing investments, commitment	2,300	1,800
Assets	478,464	455,249
VIE, reporting entity involvement, maximum loss exposure	6,175	5,281
Unconsolidated
Variable Interest Entity [Line Items]
Assets	6,175	5,281
Consolidated
Variable Interest Entity [Line Items]
Assets	33,288	31,045
Affordable housing entities
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	5,726	4,944
Affordable housing entities | Unconsolidated
Variable Interest Entity [Line Items]
Assets	5,726	4,944
Total assets of the unconsolidated VIE investment funds	18,600	12,500
Affordable housing entities | Consolidated
Variable Interest Entity [Line Items]
Assets	297	261
Entities that provide capital to low-income and rural communities
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	0	0
Entities that provide capital to low-income and rural communities | Unconsolidated
Variable Interest Entity [Line Items]
Assets	0	0
Entities that provide capital to low-income and rural communities | Consolidated
Variable Interest Entity [Line Items]
Assets	2,498	2,301
Other
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	449	337
Other | Unconsolidated
Variable Interest Entity [Line Items]
Assets	449	337
Other | Consolidated
Variable Interest Entity [Line Items]
Assets	$ 0	$ 0