Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Type (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Total revenue	$ 5,197	$ 4,522	$ 14,730	$ 13,228
Investment Advisory, Administration Fees and Securities Lending Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	4,030	3,681	11,683	10,794
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Equity Active Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	553	510	1,608	1,516
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Equity ETFs [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,309	1,136	3,749	3,316
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Equity Non-ETF Index [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	198	186	575	560
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Equity [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,060	1,832	5,932	5,392
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Fixed Income Active [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	493	479	1,458	1,429
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Fixed Income ETFs [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	354	315	1,007	919
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Fixed Income Non-ETF Index [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	93	93	273	268
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Fixed Income [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	940	887	2,738	2,616
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Multi-asset [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	325	308	952	904
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Alternatives [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	441	420	1,305	1,213
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Alternatives [Member] | Illiquid Alternatives [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	235	231	716	638
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Alternatives [Member] | Liquid Alternatives [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	143	143	422	434
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Alternatives [Member] | Currency and Commodities [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	63	46	167	141
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Cash Management [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	264	234	756	669
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Long-term [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	3,766	3,447	10,927	10,125
Investment Advisory Performance Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	388	70	756	243
Investment Advisory Performance Fees [Member] | Equity [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	13	17	49	38
Investment Advisory Performance Fees [Member] | Fixed Income [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	3	1	12	2
Investment Advisory Performance Fees [Member] | Multi-asset [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1	5	14	23
Investment Advisory Performance Fees [Member] | Alternatives [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	371	47	681	180
Investment Advisory Performance Fees [Member] | Alternatives [Member] | Illiquid Alternatives [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	7	24	200	124
Investment Advisory Performance Fees [Member] | Alternatives [Member] | Liquid Alternatives [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	364	23	481	56
Technology Services Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	403	407	1,175	1,106
Distribution Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	323	321	951	959
Advisory and Other Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	53	43	165	126
Advisory and Other Revenue [Member] | Advisory [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	11	21	35	66
Advisory and Other Revenue [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 42	$ 22	$ 130	$ 60