Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Client Type and Investment Style (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 19,374	$ 16,205	$ 14,539
Revenue by Client Type [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	15,260	12,639	11,777
Revenue by Client Type [Member] \| Retail [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	4,957	3,651	3,411
Revenue by Client Type [Member] \| Equity ETFs [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	6,074	4,788	4,564
Revenue by Client Type [Member] \| Institutional Active [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,675	2,342	2,172
Revenue by Client Type [Member] \| Institutional Index [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,084	1,068	1,012
Revenue by Client Type [Member] \| Institutional [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	3,759	3,410	3,184
Revenue by Client Type [Member] \| Cash Management [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	470	790	618
Revenue by Client Type [Member] \| Long-term [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	14,790	11,849	11,159
Revenue by Investment Style [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	15,260	12,639	11,777
Revenue by Investment Style [Member] \| Active [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	7,455	5,914	5,510
Revenue by Investment Style [Member] \| Cash Management [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	470	790	618
Revenue by Investment Style [Member] \| Equity Index and ETFs [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	7,335	5,935	5,649
Revenue by Investment Style [Member] \| Long-term [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 14,790	$ 11,849	$ 11,159