Quarterly Financial Information - Quarterly Financial Information (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2011
Quarterly Financial Information [Line Items]
Reduction In Revenue Due To Immaterial Restatement	$ 12
Reduction In Income Due To Immaterial Restatement	7
Reduction In Net Income Due To Immaterial Restatement	$ 7

Reduction In Net Income Due To Immaterial Restatement

No definition available.

Name:	ck0000711513_ReductionInNetIncomeDueToImmaterialRestatement
Namespace Prefix:	ck0000711513_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration