Bank Deposits (Deposits from Banking Clients Consisting of Interest Bearing and Noninterest Bearing Deposits) (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Interest-bearing deposits:
Deposits swept from brokerage accounts		$ 332,513	$ 201,531
Checking		17,785	12,650
Savings and other		6,739	5,168
Total interest-bearing deposits		357,037	219,349
Non-interest-bearing deposits		985	745
Total bank deposits	[1]	$ 358,022	$ 220,094

[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.