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Acquisition and Divestiture Activity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 16, 2020 | May 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2021
Business Acquisition [Line Items] |  |  |  |  |  |
Gain (loss) on disposition of business |  |  | $ 5,740.0 |  |  |
Discontinued Operations, Disposed of by Sale | BlackRock, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Discontinued operations, number of shares contributed |  | 500,000 |  |  |  |
Discontinued Operations, Disposed of by Sale | BlackRock, Inc. | Registered Secondary Offering |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock repurchased (in shares) |  | 31,600,000 |  |  |  |
Sale of stock, price per share (in dollars per share) |  | $ 420 |  |  |  |
Sale of stock, consideration received on transaction |  | $ 14,200.0 |  |  |  |
Payments of stock issuance costs |  | 200.0 |  |  |  |
Gain (loss) on disposition of business |  | $ 4,300.0 |  |  |  |
Discontinued Operations, Disposed of by Sale | BlackRock, Inc. | BlackRock, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock repurchased (in shares) |  | 2,650,000 |  |  |  |
Sale of stock, price per share (in dollars per share) |  | $ 414.96 |  |  |  |
BBVA USA Bancshares, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, consideration transferred | $ 11,600.0 |  |  |  |  |
Forecast | BBVA USA Bancshares, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, assets |  |  |  |  |  | $ 102,000.0
Business combination, recognized identifiable assets acquired and liabilities assumed, deposits |  |  |  |  |  | 86,000.0
Business combination, recognized identifiable assets acquired and liabilities assumed, loans |  |  |  |  |  | $ 66,000.0

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