XML 75 R63.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Activity Associated with Derivative Instruments (Detail) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 USD ($) Policies
Derivative [Line Items] |
Notional amount, beginning balance | $ 12,634
Additions | 4,443
Maturities/ terminations | (3,211)
Notional amount, ending balance | 13,866
Designated As Hedging Instrument |
Derivative [Line Items] |
Notional amount, beginning balance | 10,181
Additions | 1,772
Maturities/ terminations | (399)
Notional amount, ending balance | 11,554
Designated As Hedging Instrument | Cash Flow Hedges |
Derivative [Line Items] |
Notional amount, beginning balance | 10,181
Additions | 1,772
Maturities/ terminations | (399)
Notional amount, ending balance | 11,554
Designated As Hedging Instrument | Cash Flow Hedges | Interest rate swaps |
Derivative [Line Items] |
Notional amount, beginning balance | 8,975
Additions | 231
Maturities/ terminations | (399)
Notional amount, ending balance | 8,807
Designated As Hedging Instrument | Cash Flow Hedges | Foreign currency swaps |
Derivative [Line Items] |
Notional amount, beginning balance | 131
Additions | 13
Maturities/ terminations | 0
Notional amount, ending balance | 144
Designated As Hedging Instrument | Forward bond purchase commitments | Cash Flow Hedges |
Derivative [Line Items] |
Notional amount, beginning balance | 1,075
Additions | 1,528
Maturities/ terminations | 0
Notional amount, ending balance | 2,603
Derivatives not designated as hedges |
Derivative [Line Items] |
Notional amount, beginning balance | 2,453
Additions | 2,671
Maturities/ terminations | (2,812)
Notional amount, ending balance | 2,312
Derivatives not designated as hedges | Equity index options |
Derivative [Line Items] |
Notional amount, beginning balance | 702
Additions | 308
Maturities/ terminations | (357)
Notional amount, ending balance | 653
Derivatives not designated as hedges | Financial futures |
Derivative [Line Items] |
Notional amount, beginning balance | 1,251
Additions | 2,363
Maturities/ terminations | (2,455)
Notional amount, ending balance | $ 1,159
Derivatives not designated as hedges | Fixed indexed annuity embedded derivatives |
Derivative [Line Items] |
Notional amount, beginning balance | Policies | 5,826
Additions | Policies | 0
Maturities/ terminations | Policies | (530)
Notional amount, ending balance | Policies | 5,296
Derivatives not designated as hedges | Indexed universal life embedded derivatives |
Derivative [Line Items] |
Notional amount, beginning balance | Policies | 749
Additions | Policies | 0
Maturities/ terminations | Policies | (17)
Notional amount, ending balance | Policies | 732
Derivatives not designated as hedges | Forward bond purchase commitments |
Derivative [Line Items] |
Notional amount, beginning balance | $ 500
Additions | 0
Maturities/ terminations | 0
Notional amount, ending balance | $ 500

X
- Definition Additions during period to notional amount of derivatives. + References No definition available. + Details
Name: | gnw_NotionalAmountOfDerivativesAdditions
Namespace Prefix: | gnw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Terminations during period of notional amount of derivatives. + References No definition available. + Details
Name: | gnw_NotionalAmountOfDerivativesTerminations
Namespace Prefix: | gnw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate number of policies under embedded derivatives. Expressed as an absolute value. + References No definition available. + Details
Name: | gnw_NumberOfPolicies
Namespace Prefix: | gnw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Additions during period to policies with embedded derivative features. + References No definition available. + Details
Name: | gnw_NumberOfPoliciesAdditions
Namespace Prefix: | gnw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maturities and/or terminations during period of policies with embedded derivative features. + References No definition available. + Details
Name: | gnw_NumberOfPoliciesTerminations
Namespace Prefix: | gnw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CurrencySwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=gnw_EquityIndexOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FutureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gnw_IndexedUniversalLifeEmbeddedDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |