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v2.4.0.8

Long-term debt (Details) (Unsecured Debt, USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Sep. 30, 2014
Unsecured Debt |
Extinguishment of Debt [Line Items] |
Extinguishment of Debt, Amount | $ 350

X
- Definition Gross amount of debt extinguished. + References No definition available. + Details
Name: | us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ExtinguishmentOfDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration