Variable Interest Entities and Securitizations - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Amortization method qualified affordable housing investments, amortization	$ 633	$ 556
Affordable housing tax credits	644	607
Amortization method qualified affordable housing investments	4,700	4,500
Qualified affordable housing investments, commitment	1,700	1,500
Carrying Amount of Assets	432,381	421,602
VIE, reporting entity involvement, maximum loss exposure	5,157	5,038
Unconsolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	5,157	5,038
Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	26,458	26,619
Affordable housing entities
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	4,774	4,602
Affordable housing entities | Unconsolidated
Variable Interest Entity [Line Items]
Total assets of the unconsolidated VIE investment funds	11,900	11,000
Carrying Amount of Assets	4,774	4,602
Affordable housing entities | Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	263	242
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	2,074	1,951
Other
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	383	436
Other | Unconsolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	383	436
Other | Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	$ 0	$ 0