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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Repayment of claim of right income | $ 0 | $ 2 | $ 14
Amount of unrecognized deferred tax liability, reinvested earnings of foreign subsidiaries | 18 |  |
reinvested earnings of foreign subsidiaries | 665 |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss (NOL) carry forwards | 358 | 8 |
Domestic tax credits | 176 | 0 |
Deferred tax assets, valuation allowance | 70 | 0 |
Effect of CIT Merger |  | 6 |
Unrecognized tax benefits, income tax penalties and interest accrued | 3 |  |
Unrecognized tax benefits | 30 |  | $ 31
Increase in unrecognized tax benefits is reasonably possible | 10 |  |
Decrease in unrecognized tax benefits is reasonably possible | 10 |  |
Domestic Tax Authority | Internal Revenue Service (IRS) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss (NOL) carry forwards | 192 |  |
Operating loss carryforwards | 913 |  |
Domestic tax credits | 167 |  |
State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss (NOL) carry forwards | 150 |  |
Operating loss carryforwards | 2,800 |  |
Domestic tax credits | 9 |  |
Deferred tax assets, valuation allowance | 67 |  |
Foreign Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss (NOL) carry forwards | 16 |  |
Operating loss carryforwards | 68 |  |
Deferred tax assets, valuation allowance | 3 | $ 0 |
CIT Group Inc. |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax liabilities | 300 |  |
Effect of CIT Merger | $ 6 |  |

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