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Acquisition and Divestiture Activity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Nov. 16, 2020 | May 31, 2020 | Mar. 31, 2020 | Jun. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash provided by operating activities of discontinued operations |  |  | $ 126.0 |
Discontinued Operations, Disposed of by Sale | BlackRock, Inc. |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued operations, number of shares contributed |  | 500,000 |  |
Registered Secondary Offering | Discontinued Operations, Disposed of by Sale | 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 |  |
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 |  |
BlackRock, Inc. | Discontinued Operations, Disposed of by Sale | 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) |  | 2,650,000 |  |
Sale of stock, price per share (in dollars per share) |  | $ 414.96 |  |
BBVA USA Bancshares, Inc. |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Business combination, consideration transferred | $ 11,600.0 |  |  |
BBVA USA Bancshares, Inc. | Forecast |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [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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