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Investments - Additional Information (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Investments [Line Items] |  |  |
Fair Value, Concentration of Risk, Investments | $ 0 | $ 0 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 547 |  |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 95.00% |  |
Number of loans held-for-sale | 0 | 0 |
Financing Receivable, Modifications, Number of Contracts | 0 |  |
LTV ratio | 55.00% |  |
LTV ratio at origination | 60.00% |  |
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding | $ 6,900 | $ 6,400 |
Loans serviced on behalf of third parties | 3,700 | 3,500 |
Loans serviced on behalf of third parties, retained and reported as assets | 3,200 | 2,900 |
Servicing rights | 0 | 0 |
Maximum exposure to loss for variable interest | $ 1,300 | 1,100 |
Required collateral under securities lending | 100.00% |  |
Assets Held by Insurance Regulators | $ 2,600 | 2,300 |
Income (Loss) from Equity Method Investments | 244 | 267 | $ 214
Equity method investments | 2,000 |  |
Commitments to fund limited partnership and alternative investments | $ 804 |  |
Aggregate investment income from limited partnerships and other alternative investments | 10.00% |  |
Total assets | $ 74,111 | 70,817 |
Total liabilities | 55,555 | 54,547 |
Total net investment income | 1,846 | 1,951 | 1,780
Limited Partner [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Total net investment income | 954 | 618 | 773
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Limited Partner [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Total assets | 339,600 | 329,400 |
Total liabilities | 181,500 | 191,200 |
Total net investment income | 7,400 | 13,400 | $ 12,300
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Deposit Assets | $ 54 | 38 |
Maximum |  |  |
Schedule of Investments [Line Items] |  |  |
Term of security lending agreement | 90 days |  |
Minimum [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of fair value received at sale under repurchase agreements | 95.00% |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Commitments for variable interest | $ 768 | $ 851 |
CMBS |  |  |
Schedule of Investments [Line Items] |  |  |
Largest exposure by sector, percent of invested assets | 8.00% | 8.00% |
US Treasury Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Restricted | $ 34 | $ 37 |
Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Financing Receivable, Individually Evaluated for Impairment | 0 |  |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price | 0 |  |
Fixed maturities, available-for-sale |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Purchase Price | $ 0 |  |
Residential Mortgage Backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Largest exposure by sector, percent of invested assets |  | 9.00% |
Financial Services Sector [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Largest exposure by sector, percent of invested assets | 9.00% |  |
Fixed maturities |  |  |
Schedule of Investments [Line Items] |  |  |
Interest Receivable | $ 327 | $ 334 |
Fixed maturities | Syndicate Policyholders [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Restricted | 661 | 447 |
Fixed maturities | Lloyd's of London [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Restricted | 175 |  |
Mortgage loans |  |  |
Schedule of Investments [Line Items] |  |  |
Interest Receivable | 14 | 14 |
Mortgage loans | Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Financing Receivable, Past Due | $ 0 | $ 0 |
Debt Security, Government, Non-US [Member] | Government of United Kingdom [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Largest exposure by issuer, percent of invested assets (less than) |  | 1.00% |
Domestic [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Collateral provided by borrowers under securities lending | 102.00% |  |
Non-domestic [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Collateral provided by borrowers under securities lending | 105.00% |  |
Short-term Investments [Member] | Syndicate Policyholders [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Restricted Investments, Current | $ 26 | $ 189 |
Municipal |  |  |
Schedule of Investments [Line Items] |  |  |
Largest exposure by sector, percent of invested assets | 17.00% | 18.00% |
Municipal | New York State Dormitory Authority [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% | 1.00% |
Corporate Debt Securities [Member] | Apple Inc. [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |
Corporate Debt Securities [Member] | IBM Corporation [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |  |
Corporate Debt Securities [Member] | Wells Fargo & Company [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Largest exposure by issuer, percent of invested assets (less than) |  | 1.00% |

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