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Investments - Additional Information (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) security | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized capital gains (losses) |  |  |  |  |  |  |  |  | $ 173,000,000 | $ (83,000,000) | $ 29,000,000
AFS securities in an unrealized loss position | security | 2,526 |  |  |  |  |  |  |  | 2,526 |  |
Percentage of AFS securities depressed less than 20% of cost or amortized cost | 96.00% |  |  |  |  |  |  |  | 96.00% |  |
Mortgage loans | $ 3,175,000,000 |  |  |  | $ 2,886,000,000 |  |  |  | $ 3,175,000,000 | 2,886,000,000 |
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 | $ 920,000,000 |  |  |  | 871,000,000 |  |  |  | $ 920,000,000 | 871,000,000 |
Commitments for variable interest |  |  |  |  | 701,000,000 |  |  |  |  | 701,000,000 |
Required collateral under securities lending | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Fair value of securities on deposit | $ 2,500,000,000 |  |  |  | 2,500,000,000 |  |  |  | $ 2,500,000,000 | 2,500,000,000 |
Equity method investments | 1,200,000,000 |  |  |  |  |  |  |  | 1,200,000,000 |  |
Commitments to fund limited partnership and alternative investments | 829,000,000 |  |  |  |  |  |  |  | $ 829,000,000 |  |
Aggregate investment income from limited partnerships and other alternative investments |  |  |  |  |  |  |  |  | 10.00% |  |
Total assets | 225,260,000,000 |  |  |  | 224,576,000,000 |  |  |  | $ 225,260,000,000 | 224,576,000,000 |
Liabilities | 211,766,000,000 |  |  |  | 207,673,000,000 |  |  |  | 211,766,000,000 | 207,673,000,000 |
Net investment income |  |  |  |  |  |  |  |  | 1,603,000,000 | 1,577,000,000 | 1,561,000,000
Net income (loss) | (3,703,000,000) | $ 234,000,000 | $ (40,000,000) | $ 378,000,000 | (81,000,000) | $ 438,000,000 | $ 216,000,000 | $ 323,000,000 | (3,131,000,000) | 896,000,000 | 1,682,000,000
Limited Partner |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets | 165,900,000,000 |  |  |  | 93,700,000,000 |  |  |  | 165,900,000,000 | 93,700,000,000 |
Liabilities | 47,800,000,000 |  |  |  | 13,600,000,000 |  |  |  | 47,800,000,000 | 13,600,000,000 |
Net investment income |  |  |  |  |  |  |  |  | 1,900,000,000 | 844,000,000 | 914,000,000
Net income (loss) |  |  |  |  |  |  |  |  | 9,800,000,000 | 7,700,000,000 | 6,500,000,000
U.S. Treasuries |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pledged collateral | $ 104,000,000 |  |  |  | 102,000,000 |  |  |  | $ 104,000,000 | 102,000,000 |
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 |  |
Non-Consolidated VIE |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum exposure to loss for variable interest |  |  |  |  | 3,000,000 |  |  |  |  | 3,000,000 |
Commitments for variable interest | $ 787,000,000 |  |  |  |  |  |  |  | $ 787,000,000 |  |
Non-consolidated variable interest entities assets |  |  |  |  | 1,000,000 |  |  |  |  | 1,000,000 |
Non-consolidated variable interest entities, liabilities |  |  |  |  | 3,000,000 |  |  |  |  | 3,000,000 |
Commercial Loan |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans serviced | 1,300,000,000 |  |  |  | 901,000,000 |  |  |  | 1,300,000,000 | 901,000,000 |
Loans serviced on behalf of third parties | 402,000,000 |  |  |  | 251,000,000 |  |  |  | 402,000,000 | 251,000,000 |
Held-for-sale |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loans |  |  |  |  | 0 |  |  |  |  | 0 |
Valuation allowance |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loans | $ 24,000,000 |  |  |  | 0 |  |  |  | $ 24,000,000 | 0 |
Commercial Loan |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
LTV ratio for which valuation allowance may be recorded for loans | 90.00% |  |  |  |  |  |  |  | 90.00% |  |
Mortgage loans | $ 3,200,000,000 |  |  |  | 2,900,000,000 |  |  |  | $ 3,200,000,000 | 2,900,000,000 |
Mortgage loans | 3,175,000,000 |  |  |  | 2,886,000,000 |  |  |  | 3,175,000,000 | 2,886,000,000 |
Commercial Loan | Mortgage loans |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loans past due by 90 days or more | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |
Municipal |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Largest exposure by sector, percent of invested assets | 28.00% |  |  |  | 26.00% |  |  |  | 28.00% | 26.00% |
CMBS |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Largest exposure by sector, percent of invested assets | 7.00% |  |  |  | 7.00% |  |  |  | 7.00% | 7.00% |
RMBS |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Largest exposure by sector, percent of invested assets | 7.00% |  |  |  | 8.00% |  |  |  | 7.00% | 8.00% |
States, municipalities and political subdivisions | New York State Dormitory Authority |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |  |  | 1.00% |  |  |  | 1.00% | 1.00% |
States, municipalities and political subdivisions | New York Transitional Authority |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |  |  |  |  |  |  | 1.00% |  |
States, municipalities and political subdivisions | Commonwealth Massachusetts |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |  |  | 1.00% |  |  |  | 1.00% | 1.00% |
Corporate | State of California |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) |  |  |  |  | 1.00% |  |  |  |  | 1.00% |
CDOs |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated variable interest entities assets |  |  |  |  | $ 5,000,000 |  |  |  |  | $ 5,000,000 |
Consolidated variable interest entities liabilities |  |  |  |  | 5,000,000 |  |  |  |  | 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) |  |  |  |  |  |  |  |  | $ 152,000,000 | 36,000,000 | (5,000,000)
Net income (loss) |  |  |  |  |  |  |  |  | 202,000,000 | 86,000,000 | $ (21,000,000)
Investments | Commercial Loan |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans serviced on behalf of third parties, retained and reported as assets | $ 566,000,000 |  |  |  | 417,000,000 |  |  |  | 566,000,000 | 417,000,000 |
Assets Held for Sale | Commercial Loan |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans serviced on behalf of third parties, retained and reported as assets | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |

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