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Maximum Potential Amount of Future Fundings as the Primary Obligor for Guarantees and the Liability for Expected Future Fundings (Detail) (Primary Obligor, USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Guarantor Obligations [Line Items]  
Maximum Potential Amount of Future Fundings $ 211
Liability for Guarantees 58
Debt service
 
Guarantor Obligations [Line Items]  
Maximum Potential Amount of Future Fundings 87
Liability for Guarantees 6
Operating profit
 
Guarantor Obligations [Line Items]  
Maximum Potential Amount of Future Fundings 109
Liability for Guarantees 50
Other
 
Guarantor Obligations [Line Items]  
Maximum Potential Amount of Future Fundings 15
Liability for Guarantees $ 2