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Contingencies and Other Disclosures (Details) shares in Millions | 9 Months Ended | 36 Months Ended | 48 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) entity shares | Dec. 31, 2007 USD ($) | Dec. 31, 2008 USD ($) | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Estimated litigation liability | $ 32,800,000 |  |  |
Number of GSEs to which conventional conforming single-family mortgage loans were predominately sold to | entity | 2 |  |  |
Loan-to-value ratio at origination | 80.00% |  |  |
Subservicing agreement, period | 3 years |  |  |
Mortgage loans originated and sold to agencies |  |  | $ 69,500,000,000 |
Loans sold to GSEs |  |  | 57,600,000,000 |
Loans guaranteed by Ginnie Mae |  |  | $ 11,900,000,000 |
Loans included in FH proprietary securitizations |  | $ 26,700,000,000 |  |
Accrued losses on loan repurchase exposure | $ 32,500,000 |  |  | $ 34,200,000
Subservicer expenditure reimbursement amount disputed |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Actual damages sought by plaintiff | $ 43,500,000 |  |  |
Visa Class B Shares |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of Visa Class B shares (in shares) | shares | 2.4 |  |  |
Mortgage Securitization Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Investment in proprietary securitizations subject to lawsuits | $ 83,400,000 |  |  |
Investment in proprietary securitizations subject to indemnifications | 231,200,000 |  |  |
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated reasonably possible losses in excess of currently established liabilities | 0 |  |  |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated reasonably possible losses in excess of currently established liabilities | $ 20,000,000 |  |  |

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