Business Acquisitions (USAA-IMCO Narrative) (Details) account in Millions, $ in Millions		3 Months Ended	7 Months Ended	12 Months Ended
	May 26, 2020 USD ($) account	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 11,952	$ 11,952	$ 1,227	$ 11,952
USAA-IMCO [Member]
Business Acquisition [Line Items]
Cash purchase price	$ 1,600
Number of brokerage and managed portfolio accounts acquired | account	1
Client assets acquired	$ 80,000
Adjustment to purchase price		$ 43
Adjustment to intangible assets		9
Adjustment to goodwill		$ 34
Estimated Fair Value	1,109
Goodwill	$ 472
Net revenue attributable to acquiree			235
Net loss			$ 51
Post-closing adjustment				21
Acquisition costs				$ 54	$ 14