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Acquisition and Divestiture Activity (Consolidated Income Statement - Discontinued Operations) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income from discontinued operations before income taxes and noncontrolling interests $ 5,777
Income taxes 1,222
Net income from discontinued operations 4,555
BlackRock, Inc. | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Noninterest income       5,777
Total revenue       5,777
Income from discontinued operations before income taxes and noncontrolling interests       5,777
Income taxes       1,222
Net income from discontinued operations       $ 4,555