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Nonrecourse Debt - Schedule of Minimum Maturities of Nonrecourse Debt (Detail)

v2.4.1.9
Nonrecourse Debt - Schedule of Minimum Maturities of Nonrecourse Debt (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Debt Instrument [Line Items]  
Maturity of Nonrecourse debt, 2016 $ 36us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Maturity of Nonrecourse debt, 2017 36us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Maturity of Nonrecourse debt, 2018 34us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Maturity of Nonrecourse debt, 2019 26us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Maturity of Nonrecourse debt, 2020 85us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Maturity of Nonrecourse debt, Thereafter 103us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Maturity of Nonrecourse debt, Total 320us-gaap_LongTermDebt
Asset-Backed Nonrecourse Notes [Member]  
Debt Instrument [Line Items]  
Maturity of Nonrecourse debt, 2016 20us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
Maturity of Nonrecourse debt, 2017 20us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
Maturity of Nonrecourse debt, 2018 21us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
Maturity of Nonrecourse debt, 2019 19us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
Maturity of Nonrecourse debt, 2020 81us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
Maturity of Nonrecourse debt, Thereafter 48us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
Maturity of Nonrecourse debt, Total 209us-gaap_LongTermDebt
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
Other Nonrecourse Debt [Member]  
Debt Instrument [Line Items]  
Maturity of Nonrecourse debt, 2016 16us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_OtherNonRecourseDebtMember
Maturity of Nonrecourse debt, 2017 16us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_OtherNonRecourseDebtMember
Maturity of Nonrecourse debt, 2018 13us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_OtherNonRecourseDebtMember
Maturity of Nonrecourse debt, 2019 7us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_OtherNonRecourseDebtMember
Maturity of Nonrecourse debt, 2020 4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_OtherNonRecourseDebtMember
Maturity of Nonrecourse debt, Thereafter 55us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_OtherNonRecourseDebtMember
Maturity of Nonrecourse debt, Total $ 111us-gaap_LongTermDebt
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_OtherNonRecourseDebtMember