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v3.21.2

Segment Reporting (Narrative) (Details) | 6 Months Ended |
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Jun. 30, 2021 segment operating_unit | Jun. 30, 2020
Segment Reporting [Abstract] |  |
Segment reporting, number of segments | segment | 3 |
Number of distinct operating units | operating_unit | 2 |
BlackRock, Inc. | Discontinued Operations, Disposed of by Sale |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage |  | 22.40%

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