Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Client Type and Investment Style (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Total revenue	$ 4,805	$ 4,463	$ 9,533	$ 8,706
Revenue by Client Type [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	3,875	3,611	7,653	7,113
Revenue by Client Type [Member] \| Retail [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,053	1,044	2,094	2,076
Revenue by Client Type [Member] \| Equity ETFs [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,635	1,460	3,202	2,878
Revenue by Client Type [Member] \| Institutional Active [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	710	640	1,407	1,262
Revenue by Client Type [Member] \| Institutional Index [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	230	241	458	462
Revenue by Client Type [Member] \| Institutional [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	940	881	1,865	1,724
Revenue by Client Type [Member] \| Cash Management [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	247	226	492	435
Revenue by Client Type [Member] \| Long-term [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	3,628	3,385	7,161	6,678
Revenue by Investment Style [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	3,875	3,611	7,653	7,113
Revenue by Investment Style [Member] \| Active [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,706	1,635	3,387	3,241
Revenue by Investment Style [Member] \| Cash Management [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	247	226	492	435
Revenue by Investment Style [Member] \| Equity Index and ETFs [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,922	1,750	3,774	3,437
Revenue by Investment Style [Member] \| Long-term [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 3,628	$ 3,385	$ 7,161	$ 6,678