Variable Interest Entities and Securitizations - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Variable Interest Entity [Line Items]
Amortization method qualified affordable housing investments, amortization	$ 356	$ 345
Affordable housing tax credits	414	$ 434
Amortization method qualified affordable housing investments	5,400		$ 5,500
Qualified affordable housing investments, commitment	2,200		2,300
Assets	480,018		478,464
VIE, reporting entity involvement, maximum loss exposure	6,003		6,175
Unconsolidated
Variable Interest Entity [Line Items]
Assets	6,003		6,175
Consolidated
Variable Interest Entity [Line Items]
Assets	33,401		33,288
Affordable housing entities
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	5,603		5,726
Affordable housing entities | Unconsolidated
Variable Interest Entity [Line Items]
Assets	5,603		5,726
Total assets of the unconsolidated VIE investment funds	18,700		18,700
Affordable housing entities | Consolidated
Variable Interest Entity [Line Items]
Assets	356		297
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	2,745		2,498
Other
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	400		449
Other | Unconsolidated
Variable Interest Entity [Line Items]
Assets	400		449
Other | Consolidated
Variable Interest Entity [Line Items]
Assets	$ 0		$ 0