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Cover [Abstract] Insurance [Abstract] Insurance [Abstract] Effect of changes in cash flow assumptions Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change Equity Awards Adjustments Equity Awards Adjustments [Member] Measurement Input, Lapses, Expected Measurement Input, Lapses, Expected [Member] Measurement Input, Lapses, Expected Total liabilities and shareholders’ equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Unearned insurance premium and claim reserves Unearned Premiums And Liability For Unpaid Claims And Claim Adjustment Expense Unearned Premiums And Liability For Unpaid Claims And Claim Adjustment Expense Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text 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Disclosure Pay vs Performance Disclosure [Table] Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Total Debt Securities, Available-for-Sale, Unrealized Loss Position Due in 1 year or less Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Name Trading Arrangement, Individual Name Gross charge-offs Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Income tax effect: Other Comprehensive Income (Loss), Tax, Parenthetical Disclosure [Abstract] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Market Risk Benefit [Line Items] Market Risk Benefit [Line Items] Auto Finance Automobile Loan [Member] Effect of actual variances from expected experience Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience Principal maturities of long-term debt by type of debt Long-Term Debt, Fiscal Year Maturity [Abstract] Company Selected Measure Amount Company Selected Measure Amount Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Prior year three Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Investment securities: Investments, Debt and Equity Securities [Abstract] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Term and Whole Life Term And Whole Life Insurance [Member] Term And Whole Life Insurance 2031-2067 Long-Term Debt, Maturity, After Year Four Long-Term Debt, Maturity, After Year Four Non-PEO NEO Non-PEO NEO [Member] Unsecured Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Income taxes Income Tax Expense (Benefit) Total other expenses Noninterest Expense Market risk benefit, measurement input Market Risk Benefit, Measurement Input Award Timing Method Award Timing Method [Text Block] Balance at beginning of period Balance at ending of period Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change Fair Value Available-for-Sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] CONSOLIDATION Consolidation, Policy [Policy Text Block] Net change in cash and cash equivalents and restricted cash and restricted cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Numerator (basic and diluted): Net Income (Loss) Attributable to Parent [Abstract] Net deferred tax asset Deferred Tax Assets, Net of Valuation Allowance Consolidated VIEs Variable Interest Entity, Primary Beneficiary [Member] Interest receivable Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net income Net income Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Securities on deposit with third parties Cash Equivalent, Certificate of Deposit, Carrying Value Statement [Table] Statement [Table] Segment to GAAP Adjustment Segment 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Holdings, Inc. [Member] OneMain Holdings, Inc. Discounted Liability For Future Policy Benefit, Expected Future Policy Benefit, Discounted, Before Reinsurance Liability For Future Policy Benefit, Expected Future Policy Benefit, Discounted, Before Reinsurance Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]