Variable Interest Entities and Securitizations - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Variable Interest Entity [Line Items]
Amortization method qualified affordable housing investments, amortization	$ 161	$ 156
Affordable housing tax credits	250	$ 258
Amortization method qualified affordable housing investments	4,700		$ 4,700
Qualified affordable housing investments, commitment	1,700		1,700
Carrying Amount of Assets	434,195		432,381
VIE, reporting entity involvement, maximum loss exposure	5,070		5,157
Unconsolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	5,070		5,157
Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	24,851		26,458
Affordable housing entities
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	4,703		4,774
Affordable housing entities | Unconsolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	4,703		4,774
Total assets of the unconsolidated VIE investment funds	12,200		11,900
Affordable housing entities | Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	297		263
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	2,198		2,074
Other
Variable Interest Entity [Line Items]
VIE, reporting entity involvement, maximum loss exposure	367		383
Other | Unconsolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	367		383
Other | Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	$ 0		$ 0