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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 244 | $ 243 |  |
All other revenue | 286 | 255 |  |
Total other revenue | 530 | 498 |  |
Remarketing gains (losses), net | 46 | 47 |  |
Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 32 | 33 |  |
All other revenue | (12) | (26) |  |
Total other revenue | 20 | 7 |  |
Automotive Finance operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Remarketing gains (losses), net | 46 | 47 |  |
Automotive Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 35 | 38 |  |
All other revenue | 62 | 39 |  |
Total other revenue | 97 | 77 |  |
Insurance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 177 | 172 |  |
All other revenue | 207 | 209 |  |
Total other revenue | 384 | 381 |  |
Mortgage Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
All other revenue | 6 | 4 |  |
Total other revenue | 6 | 4 |  |
Corporate Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
All other revenue | 23 | 29 |  |
Total other revenue | 23 | 29 |  |
Noninsurance contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 173 | 169 |  |
Noninsurance contracts | Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Noninsurance contracts | Automotive Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Noninsurance contracts | Insurance operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Unearned revenue, remaining performance obligation, amount | 2,900 | 3,000 | $ 3,000 | $ 3,000
Unearned revenue, revenue recognized | 248 | 241 |  |
Capitalized contract cost, net | 1,800 | 1,800 | $ 1,800 | $ 1,800
Capitalized contract cost, amortization | 147 | 144 |  |
Noninsurance contracts | Insurance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 173 | 169 |  |
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Unearned revenue, remaining performance obligation, amount | $ 670 |  |  |
Remaining performance obligation, expected timing of satisfaction, period | 9 months |  |  |
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Unearned revenue, remaining performance obligation, amount | $ 751 |  |  |
Remaining performance obligation, expected timing of satisfaction, period | 1 year |  |  |
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Unearned revenue, remaining performance obligation, amount | $ 594 |  |  |
Remaining performance obligation, expected timing of satisfaction, period | 1 year |  |  |
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Unearned revenue, remaining performance obligation, amount | $ 422 |  |  |
Remaining performance obligation, expected timing of satisfaction, period | 1 year |  |  |
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Unearned revenue, remaining performance obligation, amount | $ 510 |  |  |
Remaining performance obligation, expected timing of satisfaction, period |  |  |  |
Noninsurance contracts | Mortgage Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 0 | 0 |  |
Noninsurance contracts | Corporate Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Remarketing fee income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 30 | 33 |  |
Remarketing fee income | Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Remarketing fee income | Automotive Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 30 | 33 |  |
Remarketing fee income | Insurance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Remarketing fee income | Mortgage Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Remarketing fee income | Corporate Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Brokerage commissions and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 23 | 23 |  |
Brokerage commissions and other revenue | Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 23 | 23 |  |
Brokerage commissions and other revenue | Automotive Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Brokerage commissions and other revenue | Insurance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Brokerage commissions and other revenue | Mortgage Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Brokerage commissions and other revenue | Corporate Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Banking fees and interchange income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 9 | 10 |  |
Customer rewards expense | 6 | 4 |  |
Banking fees and interchange income | Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 9 | 10 |  |
Banking fees and interchange income | Automotive Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Banking fees and interchange income | Insurance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Banking fees and interchange income | Mortgage Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Banking fees and interchange income | Corporate Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Brokered/agent commissions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 4 | 3 |  |
Brokered/agent commissions | Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Brokered/agent commissions | Automotive Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Brokered/agent commissions | Insurance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 4 | 3 |  |
Brokered/agent commissions | Mortgage Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Brokered/agent commissions | Corporate Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 5 | 5 |  |
Other | Corporate and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Other | Automotive Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 5 | 5 |  |
Other | Insurance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Other | Mortgage Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Other | Corporate Finance operations | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 0 | $ 0 |  |

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