Name:	bhl_CashPaidInConnectionWithFreestandingDerivatives
Namespace Prefix:	bhl_
Data Type:	xbrli:monetaryItemType
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The cash inflow provided by derivative instruments during the period, which are classified as investing activities, including both hedging and non-hedging instruments.

No definition available.

Name:	bhl_Cashreceivedinconnectionwithfreestandingderivatives
Namespace Prefix:	bhl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The excess of (1) fair value of the consideration transferred to the holders of the common stock over (2) the carrying amount of the common stock in the registrant's balance sheet, during the accounting period.

No definition available.

Name:	bhl_CommonStockRedemptionPremium
Namespace Prefix:	bhl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The net realized (gain) loss on derivatives settled during the period, net.

No definition available.

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Namespace Prefix:	bhl_
Data Type:	xbrli:monetaryItemType
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The net realized (gain) loss on investments sold during the period and from sales of businesses, net.

No definition available.

Name:	bhl_GainsLossesOnInvestmentsAndFromSalesOfBusinessesNet
Namespace Prefix:	bhl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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The net cash outflow (inflow) from other investing activities including derivative instruments, leveraged leases and other invested assets.

No definition available.

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Namespace Prefix:	bhl_
Data Type:	xbrli:monetaryItemType
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Net change in payables for collateral under securities loaned and other transactions.

No definition available.

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Namespace Prefix:	bhl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The cash outflow associated with agreements to repurchase investments from counterparties.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Reduction of other invested assets in connection with a reinsurance transaction

No definition available.

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Data Type:	xbrli:monetaryItemType
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Supplemental capital contribution from parent.

No definition available.

Name:	bhl_SupplementalCapitalContributionFromParent
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Value of short-term investments transferred from the entity's affiliates in noncash transactions.

No definition available.

Name:	bhl_TransferofShortTermInvestmentsFromAffiliates
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Value of mortgages transferred from the entity's affiliates in noncash transactions.

No definition available.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Period Type:	duration

No definition available.

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For the entity and the disposal group, cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.

No definition available.

Name:	us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Balance Type:	debit
Period Type:	duration

No definition available.

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Data Type:	xbrli:stringItemType
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Period Type:	duration

Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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Data Type:	xbrli:monetaryItemType
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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

Name:	us-gaap_IncomeTaxesPaidNet
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Balance Type:	credit
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The increase (decrease) during the reporting period in the amount due from customers for the credit sale of goods and services; includes accounts receivable and other types of receivables.

Name:	us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
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Period Type:	duration

The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

Name:	us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The increase (decrease) during the reporting period in investment income that has been earned but not yet received in cash.

Name:	us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The increase (decrease) during the reporting period in the balance sheet value of capitalized sales costs that are associated with acquiring a new insurance customers.

Name:	us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The increase (decrease) in insurance liability balances during the period.

Name:	us-gaap_IncreaseDecreaseInInsuranceLiabilities
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of increase (decrease) in operating assets classified as other.

Name:	us-gaap_IncreaseDecreaseInOtherOperatingAssets
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of increase (decrease) in operating liabilities classified as other.

Name:	us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Name:	us-gaap_InsuranceCommissionsAndFees
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Interest allocated to policyholders holding contracts under which the insurer must provide a guaranteed yield.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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Name:	us-gaap_InterestCreditedToPolicyholdersAccountBalances
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of cash paid for interest during the period.

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Name:	us-gaap_InterestPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

Name:	us-gaap_NetCashProvidedByUsedInFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

Name:	us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

Name:	us-gaap_NetCashProvidedByUsedInInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

Name:	us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Name:	us-gaap_NetCashProvidedByUsedInOperatingActivities
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Period Type:	duration

No definition available.

Name:	us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
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Amount of expense charged against earnings to allocate the cost of tangible and intangible assets over their remaining economic lives, classified as other.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).

No definition available.

Name:	us-gaap_OtherOperatingActivitiesCashFlowStatement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The net cash outflow or inflow from derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities
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Net amount paid or received by the entity associated with issuance or collection of loans made to policy holders, principally secured by the benefits under the policy.

No definition available.

Name:	us-gaap_PaymentsForProceedsFromPolicyLoans
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The net amount paid (received) by the reporting entity through acquisition or sale and maturities of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Name:	us-gaap_PaymentsForProceedsFromShortTermInvestments
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The cash outflow to reacquire common stock during the period.

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Name:	us-gaap_PaymentsForRepurchaseOfCommonStock
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Data Type:	xbrli:monetaryItemType
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The cash outflow associated with agreements to purchase and then resell securities to counterparties (reverse repurchase agreements).

No definition available.

Name:	us-gaap_PaymentsForSecuritiesPurchasedUnderAgreementsToResell
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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt securities classified as available-for-sale securities, because they are not classified as either held-to-maturity securities or trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Name:	us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
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The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Name:	us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity
Namespace Prefix:	us-gaap_
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Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes.

No definition available.

Name:	us-gaap_PaymentsToAcquireLimitedPartnershipInterests
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The cash outflow from the purchase of receivables arising from the mortgage note on real estate.

Name:	us-gaap_PaymentsToAcquireMortgageNotesReceivable
Namespace Prefix:	us-gaap_
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The cash outflow associated with the purchase of real estate held-for-investment and real estate joint ventures.

No definition available.

Name:	us-gaap_PaymentsToAcquireRealEstateAndRealEstateJointVentures
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The cash inflow from an insurance contract under which the policy holder make a lump sum payment or a series of payments in exchange for periodic payments to the policyholder beginning immediately or at some future date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Name:	us-gaap_ProceedsFromAnnuitiesAndInvestmentCertificates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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This element represents the cash inflow during the period from the sale of a component of the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Cash inflow received as distributions, returns of capital, or sale proceeds from partnership interests held for investment purposes.

No definition available.

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The cash flow from investments sold under the agreement to repurchase such investment.

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The cash inflow from the sale of real estate held-for-investment and real estate joint ventures.

No definition available.

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The cash inflow from proceeds from sale of receivables arising from the mortgage note on real estate; includes collections on mortgage notes receivable that are not classified as operating cash flows.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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The cash inflow associated with the sale of receivables arising from the financing of goods and services.

No definition available.

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Data Type:	xbrli:monetaryItemType
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The cash inflow associated with agreements to purchase and then resell securities to counterparties (reverse repurchase agreements).

No definition available.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for an insurance contract under which the policy holder make a lump sum payment or a series of payments in exchange for periodic payments to the policyholder beginning immediately or at some future date.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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No definition available.

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Value of investments transferred from the entity's investments in noncash transactions.

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Value of investments transferred to the entity's investments in noncash transactions.

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