Deferred Cash Compensation Plans and Employee Benefit Plans - Components of Deferred Cash Compensation Expense (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Compensation [Line Items]
Deferred cash compensation expense	$ 390	$ 208	$ 238
Investment Professional Deferred Compensation Program [Member]
Deferred Compensation [Line Items]
Deferred cash compensation expense	304	185	161
Voluntary Deferred Compensation Plan [Member]
Deferred Compensation [Line Items]
Deferred cash compensation expense	12	7	13
Deferred Compensation Plan Other [Member]
Deferred Compensation [Line Items]
Deferred cash compensation expense	$ 74	$ 16	$ 65

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

Name:	us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration