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Significant Accounting Policies and Basis of Presentation (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) branch state | Jan. 03, 2022 | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |
Number of branches (over) | branch | 500 |  |
Number of states in which entity operates | state | 22 |  |
Assets held for sale | $ 60 |  | $ 99
Operating lease equipment, net | $ 8,156 |  | 0
Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Lessee, renewal terms, extended lease term | 1 year |  |
Minimum | Rail Equipment |  |  |
Business Acquisition [Line Items] |  |  |
Useful Life (years) | 40 years |  |
Minimum | Other Equipment |  |  |
Business Acquisition [Line Items] |  |  |
Useful Life (years) | 3 years |  |
Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Lessee, renewal terms, extended lease term | 25 years |  |
Maximum | Rail Equipment |  |  |
Business Acquisition [Line Items] |  |  |
Useful Life (years) | 50 years |  |
Maximum | Other Equipment |  |  |
Business Acquisition [Line Items] |  |  |
Useful Life (years) | 10 years |  |
Commercial loan |  |  |
Business Acquisition [Line Items] |  |  |
Loans held for sale | $ 4 |  |
Assets held for sale | $ 48 |  |
Residential mortgage |  |  |
Business Acquisition [Line Items] |  |  |
Loans held for sale |  |  | $ 99
CIT Group Inc. | Class A Common Stock, Par Value $1 |  |  |
Business Acquisition [Line Items] |  |  |
Common stock, terms of conversion, conversion ratio |  | 0.062 |

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