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Investments - Additional Information (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) security | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net realized capital gains (losses) |  |  |  |  |  |  |  |  | $ (111,000,000) | $ 173,000,000 | $ (83,000,000) |
Net Realized and Unrealized Gain (Loss) on Trading Securities |  |  |  |  |  |  |  |  | $ (80,000,000) |  |  |
AFS securities in an unrealized loss position | security | 2,960 |  |  |  |  |  |  |  | 2,960 |  |  |
Percentage of AFS securities depressed less than 20% of cost or amortized cost | 98.00% |  |  |  |  |  |  |  | 98.00% |  |  |
Carrying Value | $ 1,000,000 |  |  |  | $ 1,000,000 |  |  |  | $ 1,000,000 | 1,000,000 | 0 | $ 4,000,000
Mortgage loans | $ 3,704,000,000 |  |  |  | 3,175,000,000 |  |  |  | $ 3,704,000,000 | 3,175,000,000 |  |
LTV ratio | 52.00% |  |  |  |  |  |  |  | 52.00% |  |  |
LTV ratio at origination | 61.00% |  |  |  |  |  |  |  | 61.00% |  |  |
Servicing rights | $ 0 |  |  |  | 0 |  |  |  | $ 0 | 0 |  |
Maximum exposure to loss for variable interest | 1,000,000,000 |  |  |  | 920,000,000 |  |  |  | 1,000,000,000 | 920,000,000 |  |
Commitments for variable interest | $ 718,000,000 |  |  |  | 787,000,000 |  |  |  | $ 718,000,000 | 787,000,000 |  |
Required collateral under securities lending | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |
Fair value of securities on deposit | $ 2,200,000,000 |  |  |  | 2,500,000,000 |  |  |  | $ 2,200,000,000 | 2,500,000,000 |  |
Income (Loss) from Equity Method Investments |  |  |  |  |  |  |  |  | 214,000,000 | 168,000,000 | 137,000,000 |
Equity method investments | 1,500,000,000 |  |  |  |  |  |  |  | 1,500,000,000 |  |  |
Commitments to fund limited partnership and alternative investments | 741,000,000 |  |  |  |  |  |  |  | $ 741,000,000 |  |  |
Aggregate investment income from limited partnerships and other alternative investments |  |  |  |  |  |  |  |  | 10.00% |  |  |
Total assets | 62,307,000,000 |  |  |  | 225,260,000,000 |  |  |  | $ 62,307,000,000 | 225,260,000,000 |  |
Liabilities | 49,206,000,000 |  |  |  | 211,766,000,000 |  |  |  | 49,206,000,000 | 211,766,000,000 |  |
Net investment income |  |  |  |  |  |  |  |  | 1,780,000,000 | 1,603,000,000 | 1,577,000,000 |
Net income (loss) | 196,000,000 | $ 432,000,000 | $ 582,000,000 | $ 597,000,000 | (3,703,000,000) | $ 234,000,000 | $ (40,000,000) | $ 378,000,000 | 1,807,000,000 | (3,131,000,000) | 896,000,000 |
Fair Value, Concentration of Risk, Investments | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Financing Receivable, Modifications, Recorded Investment | 0 |  |  |  |  |  |  |  | 0 |  |  |
Limited Partner |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 311,000,000,000 |  |  |  | 165,900,000,000 |  |  |  | 311,000,000,000 | 165,900,000,000 |  |
Liabilities | $ 187,700,000,000 |  |  |  | 47,800,000,000 |  |  |  | 187,700,000,000 | 47,800,000,000 |  |
Net investment income |  |  |  |  |  |  |  |  | 773,000,000 | 1,900,000,000 | 844,000,000 |
Net income (loss) |  |  |  |  |  |  |  |  | $ 12,300,000,000 | 9,800,000,000 | 7,700,000,000 |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Collateral provided by borrowers under securities lending | 102.00% |  |  |  |  |  |  |  | 102.00% |  |  |
Percentage of fair value received at sale under repurchase agreements | 95.00% |  |  |  |  |  |  |  | 95.00% |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Collateral provided by borrowers under securities lending | 105.00% |  |  |  |  |  |  |  | 105.00% |  |  |
Term of security lending agreement |  |  |  |  |  |  |  |  | 90 days |  |  |
Commercial Loan |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans serviced | $ 6,000,000,000.0 |  |  |  | 1,300,000,000 |  |  |  | $ 6,000,000,000.0 | 1,300,000,000 |  |
Loans serviced on behalf of third parties | 3,600,000 |  |  |  | 402,000,000 |  |  |  | 3,600,000 | 402,000,000 |  |
Loans serviced on behalf of third parties, retained and reported as assets | 2,400,000,000 |  |  |  |  |  |  |  | 2,400,000,000 |  |  |
U.S. Treasuries |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Restricted | 47,000,000 |  |  |  | 104,000,000 |  |  |  | 47,000,000 | 104,000,000 |  |
Valuation allowance |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans | $ 23,000,000 |  |  |  |  |  |  |  | $ 23,000,000 |  |  |
Investments | Commercial Loan |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans serviced on behalf of third parties, retained and reported as assets |  |  |  |  | 566,000,000 |  |  |  |  | 566,000,000 |  |
Assets Held for Sale | Commercial Loan |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans serviced on behalf of third parties, retained and reported as assets |  |  |  |  | 356,000,000 |  |  |  |  | 356,000,000 |  |
Commercial Loan |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
LTV ratio for which valuation allowance may be recorded for loans | 90.00% |  |  |  |  |  |  |  | 90.00% |  |  |
Carrying Value | $ 1,000,000 |  |  |  | 1,000,000 |  |  |  | $ 1,000,000 | 1,000,000 |  |
Mortgage loans | 3,704,000,000 |  |  |  | 3,175,000,000 |  |  |  | 3,704,000,000 | 3,175,000,000 |  |
Commercial Loan | Mortgage loans |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans past due by 90 days or more | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |  |
CMBS |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Largest exposure by sector, percent of invested assets | 8.00% |  |  |  | 7.00% |  |  |  | 8.00% | 7.00% |  |
Municipal |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Largest exposure by sector, percent of invested assets | 22.00% |  |  |  | 28.00% |  |  |  | 22.00% | 28.00% |  |
Residential mortgage-backed securities (RMBS) |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Largest exposure by sector, percent of invested assets | 7.00% |  |  |  | 7.00% |  |  |  | 7.00% | 7.00% |  |
New York State Dormitory Authority | States, municipalities and political subdivisions |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |  |  | 1.00% |  |  |  | 1.00% | 1.00% |  |
New York Transitional Authority | States, municipalities and political subdivisions |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |  |  |  |  |  |  | 1.00% |  |  |
New York Transitional Authority | Corporate |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) |  |  |  |  | 1.00% |  |  |  |  | 1.00% |  |
Commonwealth Massachusetts | States, municipalities and political subdivisions |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |  |  | 1.00% |  |  |  | 1.00% | 1.00% |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ (69,000,000) | $ (269,000,000) | (5,000,000) |
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss) |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net realized capital gains (losses) |  |  |  |  |  |  |  |  | (80,000,000) | 152,000,000 | 36,000,000 |
Net income (loss) |  |  |  |  |  |  |  |  | (65,000,000) | 202,000,000 | $ 86,000,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |  |

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