Supplemental information to the Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Supplemental Cash Flow Information [Abstract]
Transfers from loans to other assets for other real estate owned	$ 1	$ 1
Change in assets of consolidated investment management funds	18	343
Change in liabilities of consolidated investment management funds	2	3
Change in nonredeemable noncontrolling interests of consolidated investment management funds	130	149
Securities purchased not settled	531	846
Securities sold not settled	29	0
Available-for-sale securities transferred to held-to-maturity	11,028	0
Premises and equipment/capitalized software funded by finance lease obligations	11	0
Premises and equipment/operating lease obligations	$ 72	$ 126