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Investments - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Concentration Risk [Line Items] |  |  |  |
Fair Value, Concentration of Risk, Investments | $ 0 | $ 0 |  |
AFS securities in an unrealized loss position | 871 |  |  |
Percentage of AFS securities depressed less than 20% of cost or amortized cost | 96.00% |  |  |
Mortgage loans | $ 4,215,000,000 | 3,704,000,000 |  |
Carrying Value | $ 0 | 1,000,000 | $ 1,000,000 | $ 0
Number of loans with extensions or restructuring | 0 |  |  |
LTV ratio | 52.00% |  |  |
LTV ratio at origination | 61.00% |  |  |
Loans serviced | $ 6,400,000,000 | 6,000,000,000.0 |  |
Loans serviced on behalf of third parties | 3,500,000 | 3,600,000,000 |  |
Servicing rights | 0 | 0 |  |
Maximum exposure to loss for variable interest | $ 1,100,000,000 | 1,000,000,000.0 |  |
Required collateral under securities lending | 100.00% |  |  |
Assets Held by Insurance Regulators | $ 2,300,000,000 | 2,200,000,000 |  |
Short-term investments | 2,921,000,000 | 4,283,000,000 |  |
Income (Loss) from Equity Method Investments | 267,000,000 | 214,000,000 | 168,000,000 |
Equity method investments | 1,600,000,000 |  |  |
Commitments to fund limited partnership and alternative investments | $ 852,000,000 |  |  |
Aggregate investment income from limited partnerships and other alternative investments | 10.00% |  |  |
Net investment income | $ 1,951,000,000 | 1,780,000,000 | 1,603,000,000 |
Limited Partner [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total assets | 329,400,000,000 | 311,000,000,000.0 |  |
Liabilities | 191,200,000,000 | 187,700,000,000 |  |
Net investment income | 618,000,000 | 773,000,000 | 1,900,000,000 |
Net income (loss) | 13,400,000,000 | 12,300,000,000 | $ 9,800,000,000 |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Deposit Assets | $ 38,000,000 | 0 |  |
Minimum [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of fair value received at sale under repurchase agreements | 95.00% |  |  |
Maximum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Term of security lending agreement | 90 days |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Commitments for variable interest | $ 851,000,000 | 718,000,000 |  |
Investments [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Loans serviced on behalf of third parties, retained and reported as assets | $ 2,900,000,000 | 2,400,000,000 |  |
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Mortgage loans |  | $ 23,000,000 |  |
Number of loans with an allowance | 0 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of loans with an allowance |  | 0 |  |
Number of loans held-for-sale | 0 |  |  |
Commercial Loan [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Mortgage loans | $ 4,215,000,000 | $ 3,704,000,000 |  |
Carrying Value | 0 | 1,000,000 |  |
Commercial Loan [Member] | Amortized Cost [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Mortgage loans | 4,200,000,000 | 3,700,000,000 |  |
U.S. Treasuries |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Restricted | $ 37,000,000 | $ 47,000,000 |  |
Financial Services Sector [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Largest exposure by sector, percent of invested assets | 8.00% | 7.00% |  |
Municipal |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Largest exposure by sector, percent of invested assets | 18.00% | 22.00% |  |
CMBS |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Largest exposure by sector, percent of invested assets | 9.00% | 8.00% |  |
Mortgage loans | Commercial Loan [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Mortgage loans past due by 90 days or more | 0 | 0 |  |
Domestic [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Collateral provided by borrowers under securities lending | 102.00% |  |  |
Non-domestic [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Collateral provided by borrowers under securities lending | 105.00% |  |  |
Fixed maturities |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Restricted | $ 447,000,000 |  |  |
Short-term Investments [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Short-term investments | $ 189,000,000 |  |  |
Government of United Kingdom [Member] | Debt Security, Government, Non-US [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |  |
New York State Dormitory Authority [Member] | Municipal |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% | 1.00% |  |
Wells Fargo & Company [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |  |
New York Transitional Authority [Member] | Municipal |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) |  | 1.00% |  |
Commonwealth Massachusetts [Member] | Municipal |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Largest exposure by issuer, percent of invested assets (less than) |  | 1.00% |  |

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