Discontinued Operations (Narrative) (Details) - Discontinued Operations, Disposed of by Sale - USD ($) $ / shares in Units, $ in Billions	May 18, 2020	May 15, 2020
BlackRock, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses		$ 14.2
Divestiture of business, transaction expenses		0.2
Gain (loss) on sale of disposal group		$ 4.3
Discontinued operations, number of shares contributed	500,000
BlackRock, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of stock, price per share (in dollars per share)		$ 414.96
Stock repurchased in period (in shares)		2,650,000
Registered Secondary Offering \| BlackRock, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of stock, number of shares issued in transaction (in shares)		31,600,000
Sale of stock, price per share (in dollars per share)		$ 420

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Disposal Group, Including Discontinued Operation, Transaction Expenses

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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