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Discontinued Operations (Narrative) (Details) - Discontinued Operations, Disposed of by Sale - USD ($) $ / shares in Units, $ in Billions | May 18, 2020 | May 15, 2020
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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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