Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Interest revenue	[1]									$ 6,531		$ 7,580		$ 6,680
Interest expense	[1]									(418)		(1,064)		(857)
Net interest revenue	[1]									6,113		6,516		5,823
Other	[1]									332		242		178
Total net revenues		$ 4,176	$ 2,448	$ 2,450	$ 2,617	$ 2,606	$ 2,711	$ 2,681	$ 2,723	11,691	[1]	10,721	[1]	10,132	[1]
Asset Management and administration fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	[1],[2]									3,475		3,211		3,229
Asset Management and administration fees, Mutual funds, ETFs, and CTFs [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers										1,770		1,747		1,837
Asset Management and administration fees, Advice solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers										1,443		1,198		1,139
Asset Management and administration fees, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers										262		266		253
Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	[1]									1,416		752		902
Trading revenue, Commissions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers										739		549		685
Trading revenue, Order Flow Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers										621		135		139
Trading revenue, Principal Transactions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers										56		68		78
Bank Deposit Account Fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	[1]									$ 355		$ 0		$ 0

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

[2] Includes fee waivers of $127 million for the year ended December 31, 2020.