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Fair Value Measurements - Significant Unobservable Inputs Securities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | $ 36,194 | $ 36,964
CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | 3,494 | 3,336
Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | 13,349 | 12,804
Municipal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | 11,142 | 12,485
RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | 3,207 | 3,044
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | 1,952 | 1,952
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | 28 | 69
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | 559 | 520
Significant Unobservable Inputs (Level 3) | Municipal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | 9 | 17
Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | 1,137 | 1,230
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | $ 17 | $ 56
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | CMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 9.00% | 9.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | CMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 1040.00% | 1040.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | CMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 182.00% | 400.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | $ 284 | $ 251
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 113.00% | 103.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 767.00% | 1000.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 209.00% | 242.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | $ 9 | $ 17
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 161.00% | 192.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 161.00% | 250.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 161.00% | 219.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available-for-sale Securities, Debt Securities | $ 1,071 | $ 1,215
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | RMBS | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 19.00% | 24.00%
Constant prepayment rate | 1.00% | 1.00%
Constant default rate | 0.00% | 0.00%
Loss severity | 0.00% | 0.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | RMBS | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 326.00% | 351.00%
Constant prepayment rate | 25.00% | 25.00%
Constant default rate | 8.00% | 9.00%
Loss severity | 100.00% | 100.00%
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | RMBS | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Spread | 69.00% | 74.00%
Constant prepayment rate | 7.00% | 6.00%
Constant default rate | 4.00% | 4.00%
Loss severity | 58.00% | 66.00%

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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