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Borrowings - Additional Information (Detail)
€ in Millions, £ in Millions
 1 Months Ended 12 Months Ended
May 06, 2015
EUR (€)
Apr. 30, 2025
EUR (€)
Apr. 30, 2020
USD ($)
Jan. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2025
GBP (£)
Apr. 30, 2025
USD ($)
Apr. 30, 2025
EUR (€)
May 30, 2023
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]                                
Line of credit facility, covenant terms                 The 2025 Credit Facility requires the Company not to exceed a maximum consolidated leverage ratio (ratio of net debt to earnings before interest, taxes, depreciation and amortization, where net debt equals total debt less unrestricted cash) of 3.5 to 1,              
Aggregate principal amounts outstanding                 $ 12,875,000,000              
Borrowings                 12,768,000,000 $ 12,314,000,000            
Fair Value                 12,546,000,000 11,700,000,000            
Aggregate principal amount                 12,875,000,000              
Repayments of long-term borrowings                 796,000,000 1,000,000,000 $ 0          
Gain (loss) from net investment hedging, net of tax                 (96,000,000) 37,000,000 (20,000,000)          
3.75% Senior Unsecured and Unsubordinated Notes due 2035 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 1,200,000,000         € 1,000    
Aggregate principal amount                 $ 1,200,000,000         € 1,000    
Debt instrument, interest rate                         3.75% 3.75%    
Debt instrument, maturity date   Jul. 18, 2035                            
Debt instrument, redemption period, end date   Apr. 18, 2035                            
Debt Instrument, redemption price, percentage of principal amount redeemed   100.00%                            
Unsecured Debt 2027 Notes [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding               $ 700,000,000                
Aggregate principal amount               $ 700,000,000                
Debt instrument, interest rate               3.20%                
Debt instrument, maturity date                 Mar. 15, 2027              
Debt instrument, Approximate annual interest expense               $ 22,000,000                
Debt instrument, payment terms                 Interest is payable semi-annually on March 15 and September 15 of each year              
Unsecured Debt 2024 Notes [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, payment terms                 New BlackRock Guarantee. On October 1, 2024, in connection with the closing of the GIP Transaction, BlackRock, Inc. also entered into a guarantee (the “New BlackRock Guarantee”) pursuant to which BlackRock, Inc. fully and unconditionally guaranteed, on a senior unsecured basis, the obligations of Old BlackRock with respect to the Old BlackRock Notes. The New BlackRock Guarantee ranks equally in right of payment with all of BlackRock, Inc.'s other unsubordinated indebtedness. The New BlackRock Guarantee will be automatically and unconditionally released and discharged, and BlackRock, Inc. will be released from all obligations under the New BlackRock Guarantee, in certain circumstances as described in the New BlackRock Guarantee.              
Commercial Paper [Member]                                
Debt Instrument [Line Items]                                
Maximum amount available under facility                 $ 5,000,000,000              
Amount outstanding under credit facility                 0              
2025 Revolving Credit Facility [Member]                                
Debt Instrument [Line Items]                                
Unsecured revolving credit facility                 $ 5,900,000,000       $ 500,000,000      
Maximum leverage ratio required by credit facility                 3.5 to 1              
Additional amount available, subject to lender credit approval                 $ 1,400,000,000              
Maximum amount available under facility                 7,300,000,000              
Amount outstanding under credit facility                 $ 0              
Line of credit facility, covenant compliance                 less than 1 to 1              
2025 Subsidiary Credit Facility [Member] | Subsidiaries [Member]                                
Debt Instrument [Line Items]                                
Maximum amount available under facility                 $ 34,000,000     £ 25        
Aggregate principal amounts outstanding                 0              
Aggregate principal amount                 0              
Notes due 2025 [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, Approximate annual interest expense   € 38             44,000,000              
Debt instrument, payment terms   annually on July 18 of each year                            
Gain (loss) from net investment hedging, net of tax                 (96,000,000) 37,000,000 (20,000,000)          
Gain (loss) from net investment hedging, tax expense (benefit)                 (30,000,000) $ 12,000,000 $ (6,000,000)          
March 2024 Notes [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 3,000,000,000              
Aggregate principal amount                 3,000,000,000              
Debt instrument, Approximate annual interest expense                 $ 152,000,000              
Debt instrument, payment terms                 Interest on the March 2024 Notes of approximately $152 million per year is payable semi-annually on March 14 and September 14 of each year, which commenced on September 14, 2024.              
July 2024 Notes [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 $ 2,500,000,000              
Aggregate principal amount                 2,500,000,000              
July 2027 Notes [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, Approximate annual interest expense                 $ 37,000,000              
Debt instrument, payment terms                 Interest on the July 2027 Notes of approximately $37 million per year is payable semi-annually on January 26 and July 26 of each year, beginning January 26, 2025.              
July 2035 Notes [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, Approximate annual interest expense                 $ 25,000,000              
Debt instrument, payment terms                 Interest on the 2035 Notes and 2055 Notes of approximately $25 million and $64 million per year, respectively, is payable semi-annually on January 8 and July 8 of each year, beginning January 8, 2025.              
July 2055 Notes [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, Approximate annual interest expense                 $ 64,000,000              
Debt instrument, payment terms                 Interest on the 2035 Notes and 2055 Notes of approximately $25 million and $64 million per year, respectively, is payable semi-annually on January 8 and July 8 of each year, beginning January 8, 2025.              
4.70% Notes due March 2029 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 $ 500,000,000              
Aggregate principal amount                 $ 500,000,000              
Debt instrument, interest rate                 4.70%     4.70%        
Debt instrument, maturity date                 Mar. 14, 2029              
5.00% Notes due 2034 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 $ 1,000,000,000              
Borrowings                 994,000,000              
Fair Value                 1,032,000,000              
Aggregate principal amount                 $ 1,000,000,000              
Debt instrument, interest rate                 5.00%     5.00%        
Debt instrument, maturity date                 Mar. 14, 2034              
5.25% Notes due 2054 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 $ 1,500,000,000              
Borrowings                 1,470,000,000              
Fair Value                 1,436,000,000              
Aggregate principal amount                 $ 1,500,000,000              
Debt instrument, interest rate                 5.25%     5.25%        
Debt instrument, maturity date                 Mar. 14, 2054              
4.60% Notes due July 2027 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 $ 800,000,000              
Aggregate principal amount                 $ 800,000,000              
Debt instrument, interest rate                 4.60%     4.60%        
Debt instrument, maturity date                 Jul. 26, 2027              
4.90% Notes due 2035 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 $ 500,000,000              
Borrowings                 495,000,000              
Fair Value                 510,000,000              
Aggregate principal amount                 $ 500,000,000              
Debt instrument, interest rate                 4.90%     4.90%        
Debt instrument, maturity date                 Jan. 08, 2035              
5.35% Notes due 2055 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 $ 1,200,000,000              
Borrowings                 1,186,000,000              
Fair Value                 1,168,000,000              
Aggregate principal amount                 $ 1,200,000,000              
Debt instrument, interest rate                 5.35%     5.35%        
Debt instrument, maturity date                 Jan. 08, 2055              
4.75% Notes due 2033 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 $ 1,250,000,000 [1]           $ 1,250,000,000  
Borrowings [1]                 1,235,000,000              
Fair Value [1]                 1,277,000,000              
Aggregate principal amount                 $ 1,250,000,000 [1]           $ 1,250,000,000  
Debt instrument, interest rate                             4.75%  
Debt instrument, maturity date                 May 25, 2033              
Debt instrument, Approximate annual interest expense                 $ 59,000,000              
Debt instrument, payment terms                 Interest of approximately $59 million per year is payable semi-annually on May 25 and November 25 of each year, commencing on November 25, 2023              
Debt instrument, redemption period, end date                 Feb. 25, 2033              
Debt Instrument, redemption price, percentage of principal amount redeemed                 100.00%              
1.90% Notes due 2031 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding     $ 1,250,000,000           $ 1,250,000,000 [1]              
Borrowings [1]                 1,244,000,000              
Fair Value [1]                 1,123,000,000              
Aggregate principal amount     $ 1,250,000,000           $ 1,250,000,000 [1]              
Debt instrument, interest rate     1.90%                          
Debt instrument, maturity date                 Jan. 28, 2031              
Debt instrument, Approximate annual interest expense     $ 24,000,000                          
Debt instrument, payment terms                 Interest of approximately $24 million per year is payable semi-annually on January 28 and July 28 of each year, which commenced on July 28, 2020.              
Debt instrument, redemption period, end date                 Oct. 28, 2030              
Debt Instrument, redemption price, percentage of principal amount redeemed                 100.00%              
2.10% Notes due 2032 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                 $ 1,000,000,000 [1]             $ 1,000,000,000
Borrowings [1]                 991,000,000              
Fair Value [1]                 883,000,000              
Aggregate principal amount                 $ 1,000,000,000 [1]             $ 1,000,000,000
Debt instrument, interest rate                               2.10%
Debt instrument, maturity date                 Feb. 25, 2032              
Debt instrument, Approximate annual interest expense                 $ 21,000,000              
Debt instrument, payment terms                 Interest of approximately $21 million per year is payable semi-annually on February 25 and August 25 of each year, which commenced on February 25, 2022.              
Debt instrument, redemption period, end date                 Nov. 25, 2031              
Debt Instrument, redemption price, percentage of principal amount redeemed                 100.00%              
3.375% Notes due June 2022 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding                               $ 750,000,000
Aggregate principal amount                               $ 750,000,000
Debt instrument, interest rate                               3.375%
2.40% Notes due 2030 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding       $ 1,000,000,000         $ 1,000,000,000 [1]              
Borrowings [1]                 997,000,000              
Fair Value [1]                 935,000,000              
Aggregate principal amount       $ 1,000,000,000         $ 1,000,000,000 [1]              
Debt instrument, interest rate       2.40%                        
Debt instrument, maturity date                 Apr. 30, 2030              
Debt instrument, Approximate annual interest expense       $ 24,000,000                        
Debt instrument, payment terms                 Interest of approximately $24 million per year is payable semi-annually on April 30 and October 30 of each year, which commenced on April 30, 2020.              
Debt instrument, redemption period, end date                 Jan. 30, 2030              
Debt Instrument, redemption price, percentage of principal amount redeemed                 100.00%              
3.25% Notes due 2029 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding           $ 1,000,000,000     $ 1,000,000,000 [1]              
Borrowings [1]                 995,000,000              
Fair Value [1]                 978,000,000              
Aggregate principal amount           $ 1,000,000,000     $ 1,000,000,000 [1]              
Debt instrument, interest rate           3.25%                    
Debt instrument, maturity date                 Apr. 30, 2029              
Debt instrument, Approximate annual interest expense           $ 33,000,000                    
Debt instrument, payment terms                 Interest is payable semi-annually on April 30 and October 30 of each year, which commenced on October 30, 2019              
Debt instrument, redemption period, end date                 Jan. 30, 2029              
5.00% Notes due 2019 [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, interest rate         5.00%                      
Repayments of long-term borrowings         $ 1,000,000,000                      
6.25% Notes due 2017 [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, interest rate             6.25%                  
Repayments of long-term borrowings             $ 700,000,000                  
Long-term debt, maturity date             2017-09                  
1.25% Notes due 2025 [Member]                                
Debt Instrument [Line Items]                                
Aggregate principal amounts outstanding | € € 700                              
Aggregate principal amount | € € 700                              
Debt instrument, interest rate 1.25%                              
Debt instrument, maturity date May 30, 2025                              
Debt instrument, Approximate annual interest expense                 $ 11,000,000              
Debt instrument, payment terms                 annually on May 6 of each year              
[1] Issued by Old BlackRock and guaranteed by BlackRock, Inc.