Aggregate investment loss percentage of Company's pre-tax consolidated net income, minimum.

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Current weighted average loan to value ratio of commercial mortgage loan.

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- Definition

Financing Receivable, Percentage of Loan to Value For Evaluation for Impairment

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- Definition

The percent of invested assets by the Company's largest exposure by issuer.

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No definition available.

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The percent of invested assets by the Company's largest exposure by sector.

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Original weighted average loan to value ratio of commercial mortgage loan.

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No definition available.

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- Definition

Outstanding commitments to fund limited partnership and other alternative investments.

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Percentage of gross unrealized losses depressed less than twenty percent of cost or amortized cost.

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- Definition

Required Collateral Held Under Securities Lending, Percentage

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Securities Loaned, Collateral, Percentage Required at Origination

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Securities Loaned, Term

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- Definition

Securities Sold Under Agreements to Repurchase, Percentage of Fair Value Required to be Paid in Cash at Sale

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Variable Interest Entity, Reporting Entity Involvement, Commitments

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- Definition

Amount of principal due on delinquent mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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The sum of the realized and unrealized net gain (loss) on trading securities during the period.

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Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Investments - Additional Information (Details)	3 Months Ended								12 Months Ended
Investments - Additional Information (Details)	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