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Acquisition and Divestiture Activity (PCD Loan Activity) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 01, 2021 | Jun. 30, 2021 | Jun. 30, 2021
Business Acquisition [Line Items] |  |  |
ACL at acquisition |  | $ (1,115) | $ (1,115)
BBVA USA Bancshares, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Principal Balance | $ 10,253 |  |
ACL at acquisition | (1,161) |  |
Non-credit premium | 224 |  |
Purchase price | $ 9,316 |  |

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- Definition Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919265-210447 + Details
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