An adjustment to the fair value of an asset with no observable inputs based on a professional assessment.

No definition available.

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

- Definition

The net adjustment to the fair value of an asset or class of assets with no observable inputs based on a professional assessment.

+ References

No definition available.

+ Details

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

- Definition

Where the fair value of an asset with no observable inputs is derived by reference to professional publications

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Where the fair value of an asset with no observable inputs is derived from the weighted average of several professional publications

+ References

No definition available.

+ Details

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

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Period Type:	duration

Fair Value Measurements - Fair Value of Assets Measurement Date, Valuation Techniques and Related Unobservable Inputs of Those Assets (Detail) (USD $) In Millions, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Equipment Under Operating Leases Assets Held For Sale Or Re Lease [Member]	Dec. 31, 2012 Aircraft Condition Adjustments [Member]	Dec. 31, 2012 Aircraft Condition Adjustments [Member] Maximum [Member]	Dec. 31, 2012 Aircraft Condition Adjustments [Member] Minimum [Member]	Dec. 31, 2012 Aircraft Value Publications [Member]	Dec. 31, 2012 Aircraft Value Publications [Member] Maximum [Member]	Dec. 31, 2012 Aircraft Value Publications [Member] Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Median Fair Value							$ 151
Fair Value	329	252	148
Quantitative Inputs Used								184	123
Fair Value					(18)	15
Quantitative Inputs Used, Net				$ (3)