Variable Interest Entities and Securitizations - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Variable Interest Entity [Line Items]
Amortization method qualified affordable housing investments, amortization	$ 522	$ 484
Affordable housing tax credits	652	$ 582
Amortization method qualified affordable housing investments	5,300		$ 4,900
Qualified affordable housing investments, commitment	2,200		1,800
Carrying Amount of Assets	471,435		455,249
VIE, reporting entity involvement, maximum loss exposure	6,017		5,281
Unconsolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	6,017		5,281
Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	31,854		31,045
Affordable housing entities
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	5,551		4,944
Affordable housing entities | Unconsolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	5,551		4,944
Total assets of the unconsolidated VIE investment funds	12,600		12,500
Affordable housing entities | Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	271		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]
Carrying Amount of Assets	0		0
Entities that provide capital to low-income and rural communities | Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	2,509		2,301
Other
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	466		337
Other | Unconsolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	466		337
Other | Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	$ 0		$ 0