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Discontinued Operations (Consolidated Statement of Cash Flows - Discontinued Operations) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net cash provided by operating activities of discontinued operations | $ 299 | $ 264 | $ 65
BlackRock, Inc. | Discontinued Operations, Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net cash provided by operating activities of discontinued operations | $ 299 | $ 264 | $ 65

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