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Fair Value Measurements - Significant Unobservable Inputs Securities (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 36,166 | $ 36,964
CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,657 | 3,336
Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 13,492 | 12,804
Municipal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 10,602 | 12,485
RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,118 | 3,044
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 1,869 | 1,952
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 22 | 69
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 551 | 520
Significant Unobservable Inputs (Level 3) | Municipal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 9 | 17
Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 934 | 1,230
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 12 | $ 56
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 0.09 | 0.09
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 10.40 | 10.40
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 1.77 | 4.00
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 289 | $ 251
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 1.00 | 1.03
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 7.61 | 10.00
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 2.01 | 2.42
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 9 | $ 17
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 1.60 | 1.92
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 1.60 | 2.50
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 1.60 | 2.19
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 913 | $ 1,215
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 0.07 | 0.24
Constant prepayment rate | 1.00% | 1.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 2.88 | 3.51
Constant prepayment rate | 15.00% | 25.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 0.67 | 0.74
Constant prepayment rate | 6.00% | 6.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Measurement Input, Default Rate [Member] | RMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate | 1.00% | 0.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Measurement Input, Default Rate [Member] | RMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate | 8.00% | 9.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Measurement Input, Default Rate [Member] | RMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate | 3.00% | 4.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Measurement Input, Loss Severity [Member] | RMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate | 0.00% | 0.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Measurement Input, Loss Severity [Member] | RMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate | 100.00% | 100.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Measurement Input, Loss Severity [Member] | RMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate | 60.00% | 66.00%

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