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Business Combinations - Net Assets Acquired (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 20, 2023 | Dec. 01, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair value adjustments: |  |  |  |  |
Bargain purchase gain on Signature Transaction, as initially reported |  | $ 159 | $ 2,131 | $ 159 | $ 0
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) |  |  |  |
Measurement period adjustments, excluding taxes | 28 |  |  |  |
Change in deferred tax liability | 102 |  |  |  |
Signature Bridge Bank | Previously Reported |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net assets acquired before fair value adjustments | 2,086 |  |  |  |
Fair value adjustments: |  |  |  |  |
Bargain purchase gain on Signature Transaction, as initially reported | 2,001 |  |  |  |
Signature Bridge Bank | Restatement Adjustment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net assets acquired before fair value adjustments | 2,216 |  |  |  |
Fair value adjustments: |  |  |  |  |
Bargain purchase gain on Signature Transaction, as initially reported | $ 2,131 |  |  |  |

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