(Income) Expense from Divestitures, Asset Impairments and Unusual Items (Details) (USD $) In Millions	9 Months Ended	12 Months Ended
Sep. 30, 2010	Dec. 31, 2009
(Income) Expense from Divestitures, Asset Impairments and Unusual Items (Details) [Abstract]
Non-cash charge recognized due to abandonment of revenue management software		$ 51
Increase in Income from operations due to settlement related to revenue management software	$ 77

The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) litigation reserves extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

Name:	us-gaap_GainLossRelatedToLitigationSettlement
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration