Basis of Presentation and Consolidation and Recently Issued Accounting Standards (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Revenues	$ 8,452.9	$ 11,769.3	$ 16,361.6	$ 23,906.8
Cost of sales of physical commodities	8,323.7	11,654.4	16,119.5	23,673.5
Number of different types of foreign currencies			150
Number of accounts for customers company-wide			20,000
Number of customers company-wide			11,000
Scenario, Previously Reported [Member]
Revenues		13,113.1		25,832.6
Cost of sales of physical commodities		12,995.8		25,589.6
Scenario, Adjustment [Member]
Revenues		(924.6)		(1,091.3)
Cost of sales of physical commodities		(924.6)		(1,091.3)
Restatement Adjustment [Member]
Revenues		12,188.5		24,741.3
Cost of sales of physical commodities		$ 12,071.2		$ 24,498.3