Business Acquisitions (Narrative) (Details) account in Millions, $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	May 26, 2020 USD ($) account	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 1,733	$ 1,733		$ 1,733		$ 1,227
USAA-IMCO [Member]
Business Acquisition [Line Items]
Purchase price	$ 1,624
Number of brokerage and managed portfolio accounts acquired | account	1,000,000
Client assets acquired	$ 80,000
Intangible assets acquired	1,118
Goodwill	$ 506
Net revenue		39
Net income		$ 37
Termination fee			19		23
Acquisition costs			39	$ 3	54	$ 3
After-tax acquisition and integration-related costs			$ 30		$ 41		$ 10