XML 80 R39.htm IDEA: XBRL DOCUMENT v2.3.0.15
Basis Of Presentation And Accounting Policies (Details) (USD $)
In Millions
Sep. 30, 2011
Basis Of Presentation And Accounting Policies 
Receivables, change in method of calculating impairment$ 9
Allowance for credit losses, change in method of calculating impairment4
Allowance for credit losses, incremental amount$ 1