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Borrowings - Carrying Value and Fair Value of Long-Term Borrowings Determined Market Prices EUR/USD Foreign Exchange Rate (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
May 30, 2023
Dec. 31, 2021
Apr. 30, 2020
Jan. 31, 2020
Apr. 30, 2019
Debt Instrument [Line Items]              
Maturity Amount $ 12,875            
Unamortized Discount and Debt Issuance Costs [1] (107)            
Carrying Value 12,768 $ 12,314          
Fair Value 12,546 $ 11,700          
3.20% Notes due 2027 [Member]              
Debt Instrument [Line Items]              
Maturity Amount [2] 700            
Unamortized Discount and Debt Issuance Costs [2] (1)            
Carrying Value [2] 699            
Fair Value [2] 696            
4.60% Notes due 2027 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 800            
Unamortized Discount and Debt Issuance Costs [1] (2)            
Carrying Value 798            
Fair Value 810            
4.70% Notes due 2029 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 500            
Unamortized Discount and Debt Issuance Costs [1] (3)            
Carrying Value 497            
Fair Value 511            
3.25% Notes due 2029 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 1,000 [2]           $ 1,000
Unamortized Discount and Debt Issuance Costs [1],[2] (5)            
Carrying Value [2] 995            
Fair Value [2] 978            
2.40% Notes due 2030 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 1,000 [2]         $ 1,000  
Unamortized Discount and Debt Issuance Costs [1],[2] (3)            
Carrying Value [2] 997            
Fair Value [2] 935            
1.90% Notes due 2031 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 1,250 [2]       $ 1,250    
Unamortized Discount and Debt Issuance Costs [1],[2] (6)            
Carrying Value [2] 1,244            
Fair Value [2] 1,123            
2.10% Notes due 2032 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 1,000 [2]     $ 1,000      
Unamortized Discount and Debt Issuance Costs [1],[2] (9)            
Carrying Value [2] 991            
Fair Value [2] 883            
4.75% Notes due 2033 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 1,250 [2]   $ 1,250        
Unamortized Discount and Debt Issuance Costs [1],[2] (15)            
Carrying Value [2] 1,235            
Fair Value [2] 1,277            
5.00% Notes due 2034 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 1,000            
Unamortized Discount and Debt Issuance Costs [1] (6)            
Carrying Value 994            
Fair Value 1,032            
4.90% Notes due 2035 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 500            
Unamortized Discount and Debt Issuance Costs [1] (5)            
Carrying Value 495            
Fair Value 510            
3.75% Notes due 2035 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 1,175            
Unamortized Discount and Debt Issuance Costs [1] (8)            
Carrying Value 1,167            
Fair Value 1,187            
5.25% Notes due 2054 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 1,500            
Unamortized Discount and Debt Issuance Costs [1] (30)            
Carrying Value 1,470            
Fair Value 1,436            
5.35% Notes due 2055 [Member]              
Debt Instrument [Line Items]              
Maturity Amount 1,200            
Unamortized Discount and Debt Issuance Costs [1] (14)            
Carrying Value 1,186            
Fair Value $ 1,168            
[1] The unamortized discount and debt issuance costs are being amortized over the term of the notes.
[2] Issued by Old BlackRock and guaranteed by BlackRock, Inc.