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Business Combinations - Net Assets Acquired (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 20, 2023 | Mar. 19, 2023 | Dec. 31, 2023
Fair value adjustments: |  |  |
Bargain purchase gain on Signature Transaction, as initially reported |  |  | $ 2,000
Measurement Period Adjustments |  |  |
Fair value adjustments: |  |  |
Measurement period adjustments, excluding taxes |  | $ (134) |
Change in deferred tax liability |  | 143 |
Signature Bridge Bank |  |  |
Business Acquisition [Line Items] |  |  |
Net assets acquired before fair value adjustments | $ 2,973 |  |
Fair value adjustments: |  |  |
Loans | (727) |  |
Core deposit and other intangibles | 464 |  |
Certificates of deposit | 27 |  |
Other net assets and liabilities | 39 |  |
FDIC Equity Appreciation Instrument | (85) |  |
Deferred tax liability | (690) |  |
Bargain purchase gain on Signature Transaction, as initially reported | 2,010 | $ 2,010 |
Signature Bridge Bank | As Initially Reported |  |  |
Fair value adjustments: |  |  |
Bargain purchase gain on Signature Transaction, as initially reported | $ 2,001 |  |

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