XML 83 R71.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Fair Value of Financial Instruments - Summary of Significant Inputs Used by Third-Party Pricing Services for Certain Fair Value Measurements of Fixed Maturity Securities that Classified as Level 2 (Detail) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 45,233 | $ 46,781 |
Investment, Type [Extensible Enumeration] | Fixed maturity securities | Fixed maturity securities | Fixed maturity securities
U.S. government, agencies and government-sponsored enterprises |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 3,512 | $ 3,494 |
State and Political Subdivisions |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | 2,168 | 2,302 |
Non-U.S. government |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | 709 | 626 |
U.S. corporate |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | 26,813 | 27,985 |
Non-U.S. corporate |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | 7,636 | 7,811 |
Residential mortgage-backed |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | 851 | 907 |
Commercial mortgage-backed |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | 1,312 | 1,418 |
Other asset-backed |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | 2,232 | $ 2,238 |
Level 2 | Third-Party Pricing Services | Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 3,512 |  |
Primary methodologies | Price quotes from trading desk, broker feeds |  |
Significant inputs | Bid side prices, trade prices, Option Adjusted Spread (“OAS”) to swap curve, Bond Market Association OAS, Treasury Curve, Agency Bullet Curve, maturity to issuer spread |  |
Level 2 | Third-Party Pricing Services | Fixed maturity securities | State and Political Subdivisions |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 2,103 |  |
Primary methodologies | Multi-dimensional attribute-based modeling systems, third-party pricing vendors |  |
Significant inputs | Trade prices, material event notices, Municipal Market Data benchmark yields, broker quotes |  |
Level 2 | Third-Party Pricing Services | Fixed maturity securities | Non-U.S. government |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 709 |  |
Primary methodologies | Matrix pricing, spread priced to benchmark curves, price quotes from market makers |  |
Significant inputs | Benchmark yields, trade prices, broker quotes, comparative transactions, issuer spreads, bid-offer spread, market research publications, third-party pricing sources |  |
Level 2 | Third-Party Pricing Services | Fixed maturity securities | U.S. corporate |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 23,287 |  |
Primary methodologies | Multi-dimensional attribute-based modeling systems, broker quotes, price quotes from market makers, OAS-based models |  |
Significant inputs | Bid side prices to Treasury Curve, Issuer Curve, which includes sector, quality, duration, OAS percentage and change for spread matrix, trade prices, comparative transactions, Trade Reporting and Compliance Engine (“TRACE”) reports |  |
Level 2 | Third-Party Pricing Services | Fixed maturity securities | Non-U.S. corporate |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 5,976 |  |
Primary methodologies | Multi-dimensional attribute-based modeling systems, OAS-based models, price quotes from market makers |  |
Significant inputs | Benchmark yields, trade prices, broker quotes, comparative transactions, issuer spreads, bid-offer spread, market research publications, third-party pricing sources |  |
Level 2 | Third-Party Pricing Services | Fixed maturity securities | Residential mortgage-backed |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 849 |  |
Primary methodologies | OAS-based models, single factor binomial models, internally priced |  |
Significant inputs | Prepayment and default assumptions, aggregation of bonds with similar characteristics, including collateral type, vintage, tranche type, weighted-average life, weighted-average loan age, issuer program and delinquency ratio, pay up and pay down factors, TRACE reports |  |
Level 2 | Third-Party Pricing Services | Fixed maturity securities | Commercial mortgage-backed |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 1,301 |  |
Primary methodologies | Multi-dimensional attribute-based modeling systems, pricing matrix, spread matrix priced to swap curves, Trepp commercial mortgage-backed securities analytics model |  |
Significant inputs | Credit risk, interest rate risk, prepayment speeds, new issue data, collateral performance, origination year, tranche type, original credit ratings, weighted-average life, cash flows, spreads derived from broker quotes, bid side prices, spreads to daily updated swaps curves, TRACE reports |  |
Level 2 | Third-Party Pricing Services | Fixed maturity securities | Other asset-backed |  |  |
Fair value measurements Significant unobservable inputs [Line Items] |  |  |
Available-for-sale debt securities | $ 2,119 |  |
Primary methodologies | Multi-dimensional attribute-based modeling systems, spread matrix priced to swap curves, price quotes from market makers |  |
Significant inputs | Spreads to daily updated swap curves, spreads derived from trade prices and broker quotes, bid side prices, new issue data, collateral performance, analysis of prepayment speeds, cash flows, collateral loss analytics, historical issue analysis, trade data from market makers, TRACE reports |  |

X
- Definition Fair value measurements significant assumption. + References No definition available. + Details
Name: | gnw_FairValueMeasurementsSignificantAssumption
Namespace Prefix: | gnw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value measurements Significant unobservable inputs [Line Items] + References No definition available. + Details
Name: | gnw_FairValueMeasurementsSignificantUnobservableInputsLineItems
Namespace Prefix: | gnw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value measurements valuation technique. + References No definition available. + Details
Name: | gnw_FairValueMeasurementsValuationTechnique
Namespace Prefix: | gnw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Indicates type of investment. Includes, but is not limited to, common stock, preferred stock, convertible security, fixed income security, government security, option purchased, warrant, loan participation and assignment, commercial paper, bankers' acceptance, certificates of deposit, short-term security, repurchase agreement, and other investment company. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 2)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column C)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 + Details
Name: | us-gaap_InvestmentTypeExtensibleEnumeration
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_DomesticCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=gnw_OtherAssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=gnw_ThirdpartyPricingServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_FixedMaturitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |