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Fair Value Measurements - Significant Unobservable Inputs Securities (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 36,819 | $ 35,652
CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,568 | 3,552
Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 14,403 | 13,398
Municipal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 10,346 | 10,346
RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,548 | 3,279
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 1,434 | 1,565
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 12 | 12
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 525 | 520
Significant Unobservable Inputs (Level 3) | Municipal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 0 | 0
Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 771 | 920
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 93 |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2 | 2
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 294 | 274
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 725 | $ 815
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | Collateralized Loan Obligations [Member] | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 2.56 |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | Collateralized Loan Obligations [Member] | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 2.56 |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | Collateralized Loan Obligations [Member] | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 2.56 |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | CMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 0.09 | 0.09
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | CMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 10.40 | 10.40
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | CMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 1.80 | 1.82
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | Corporate | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 1.21 | 1.45
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | Corporate | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 6.56 | 11.75
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | Corporate | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 2.13 | 2.63
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | RMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 0.21 | 0.12
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | RMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 4.07 | 2.15
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Credit Spread [Member] | RMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Servicing Asset, Measurement Input | 0.78 | 0.86
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Constant Prepayment Rate [Member] | RMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant prepayment rate [6] | 0.00% | 1.00%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Constant Prepayment Rate [Member] | RMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant prepayment rate [6] | 16.00% | 15.00%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Constant Prepayment Rate [Member] | RMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant prepayment rate [6] | 6.00% | 6.00%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Default Rate [Member] | RMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate [6] | 1.00% | 1.00%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Default Rate [Member] | RMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate [6] | 6.00% | 8.00%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Default Rate [Member] | RMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate [6] | 3.00% | 3.00%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Loss Severity [Member] | RMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate [6] | 0.00% | 0.00%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Loss Severity [Member] | RMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate [6] | 100.00% | 100.00%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Measurement Input, Loss Severity [Member] | RMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Constant default rate [6] | 62.00% | 61.00%

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