Subsequent Events	3 Months Ended
Mar. 31, 2025
Subsequent Events [Abstract]
Subsequent Events	24. Subsequent Events In December 2024, BlackRock announced that it had entered into a definitive agreement to acquire 100% of the business and assets of HPS Investment Partners ("HPS"), a leading global credit investment manager with 100% of the consideration paid in BlackRock equity (the "HPS Transaction"). The equity will generally be delivered in units of a wholly-owned subsidiary of BlackRock (“SubCo Units”) which will be exchangeable on a one-for-one basis (subject to certain adjustments) into BlackRock common stock (accordingly, the value of each unit delivered will be based on the price of a share of BlackRock’s common stock and the specific terms of the SubCo Units). Approximately 9.2 million SubCo Units and RSUs will be paid at closing. Approximately 2.9 million SubCo Units will be paid in approximately five years, subject to the satisfaction of certain post-closing conditions. In addition, there is potential for additional consideration to be earned of up to 1.6 million SubCo Units that is based on financial performance milestones measured and paid in approximately five years. Of the total deal consideration, up to 0.7 million units will be used to fund an equity retention pool for HPS employees. In aggregate, inclusive of all SubCo Units paid at closing, eligible to be paid in approximately five years, and potentially earned through achievement of financial performance milestones as well as BlackRock RSUs to be issued in the transaction, the maximum amount of common stock issuable upon exchange of such SubCo Units would be approximately 13.7 million shares. The Company expects the addition of HPS will create an integrated private credit platform to provide both public and private income solutions for clients across their whole portfolios. The HPS Transaction is anticipated to close in mid-2025 subject to regulatory approvals and customary closing conditions. In April 2025, the Company issued €1.0 billion (or approximately $1.1 billion based on the EUR/USD foreign exchange rate at March 31, 2025) in aggregate principal amount of 3.75% senior unsecured and unsubordinated notes maturing July 18, 2035 (the "2035 Notes"). The 2035 Notes are listed on the New York Stock Exchange. Net proceeds are being used for general corporate purposes, including the repayment of the €700 million (or approximately $756 million based on the EUR/USD foreign exchange rate at March 31, 2025) 1.25% Notes in May 2025 at maturity. Interest of approximately €38 million (or approximately $41 million based on the EUR/USD foreign exchange rate at March 31, 2025) per year is payable annually on July 18 of each year commencing on July 18, 2025. The 2035 Notes are fully and unconditionally guaranteed (the "Guarantee") on a senior unsecured basis by Old BlackRock. The 2035 Notes and the Guarantee rank equally in right of payment with all of New BlackRock and Old BlackRock's other unsubordinated indebtedness, respectively. The 2035 Notes may be redeemed at the option of the Company, in whole or in part, at any time prior to April 18, 2035 at a "make-whole" redemption price, or thereafter at 100% of the principal amount of the 2035 Notes, in each case plus accrued but unpaid interest. The unamortized discount and debt issuance costs are being amortized over the remaining term of the 2035 Notes. In April 2025, the 2025 Credit Facility was amended to, among other things, (1) increase the aggregate commitment amount by $500 million to $5.9 billion, (2) extend the maturity date to March 2030 for lenders (other than one non-extending lender) pursuant to the Company's option to request extensions of the maturity date available under the 2025 Credit Facility (with the commitment of the non-extending lender maturing in March 2028) and (3) change the threshold for the maximum leverage ratio to 3.5 to 1. The amended 2025 Credit Facility also permits the Company to request up to an additional $1.4 billion of borrowing capacity, subject to lender credit approval, which could increase the overall size of the 2025 Credit Facility to an aggregate principal amount of up to $7.3 billion. The Company conducted a review for additional subsequent events and determined that no subsequent events had occurred that would require accrual or additional disclosures.

Subsequent Events

3 Months Ended

Mar. 31, 2025

24. Subsequent Events

In December 2024, BlackRock announced that it had entered into a definitive agreement to acquire 100% of the business and assets of HPS Investment Partners ("HPS"), a leading global credit investment manager with 100% of the consideration paid in BlackRock equity (the "HPS Transaction"). The equity will generally be delivered in units of a wholly-owned subsidiary of BlackRock (“SubCo Units”) which will be exchangeable on a one-for-one basis (subject to certain adjustments) into BlackRock common stock (accordingly, the value of each unit delivered will be based on the price of a share of BlackRock’s common stock and the specific terms of the SubCo Units). Approximately 9.2 million SubCo Units and RSUs will be paid at closing. Approximately 2.9 million SubCo Units will be paid in approximately five years, subject to the satisfaction of certain post-closing conditions. In addition, there is potential for additional consideration to be earned of up to 1.6 million SubCo Units that is based on financial performance milestones measured and paid in approximately five years. Of the total deal consideration, up to 0.7 million units will be used to fund an equity retention pool for HPS employees. In aggregate, inclusive of all SubCo Units paid at closing, eligible to be paid in approximately five years, and potentially earned through achievement of financial performance milestones as well as BlackRock RSUs to be issued in the transaction, the maximum amount of common stock issuable upon exchange of such SubCo Units would be approximately 13.7 million shares. The Company expects the addition of HPS will create an integrated private credit platform to provide both public and private income solutions for clients across their whole portfolios. The HPS Transaction is anticipated to close in mid-2025 subject to regulatory approvals and customary closing conditions.

In April 2025, the Company issued €1.0 billion (or approximately $1.1 billion based on the EUR/USD foreign exchange rate at March 31, 2025) in aggregate principal amount of 3.75% senior unsecured and unsubordinated notes maturing July 18, 2035 (the "2035 Notes"). The 2035 Notes are listed on the New York Stock Exchange. Net proceeds are being used for general corporate purposes, including the repayment of the €700 million (or approximately $756 million based on the EUR/USD foreign exchange rate at March 31, 2025) 1.25% Notes in May 2025 at maturity. Interest of approximately €38 million (or approximately $41 million based on the EUR/USD foreign exchange rate at March 31, 2025) per year is payable annually on July 18 of each year commencing on July 18, 2025. The 2035 Notes are fully and unconditionally guaranteed (the "Guarantee") on a senior unsecured basis by Old BlackRock. The 2035 Notes and the Guarantee rank equally in right of payment with all of New BlackRock and Old BlackRock's other unsubordinated indebtedness, respectively. The 2035 Notes may be redeemed at the option of the Company, in whole or in part, at any time prior to April 18, 2035 at a "make-whole" redemption price, or thereafter at 100% of the principal amount of the 2035 Notes, in each case plus accrued but unpaid interest. The unamortized discount and debt issuance costs are being amortized over the remaining term of the 2035 Notes.

In April 2025, the 2025 Credit Facility was amended to, among other things, (1) increase the aggregate commitment amount by $500 million to $5.9 billion, (2) extend the maturity date to March 2030 for lenders (other than one non-extending lender) pursuant to the Company's option to request extensions of the maturity date available under the 2025 Credit Facility (with the commitment of the non-extending lender maturing in March 2028) and (3) change the threshold for the maximum leverage ratio to 3.5 to 1. The amended 2025 Credit Facility also permits the Company to request up to an additional $1.4 billion of borrowing capacity, subject to lender credit approval, which could increase the overall size of the 2025 Credit Facility to an aggregate principal amount of up to $7.3 billion.

The Company conducted a review for additional subsequent events and determined that no subsequent events had occurred that would require accrual or additional disclosures.