Derivatives (Details) In Thousands, unless otherwise specified	Mar. 31, 2013 Derivatives designated as hedging instruments Cash flow hedges Foreign currency contracts (long) 2013 EUR USD ($)	Mar. 31, 2013 Derivatives designated as hedging instruments Cash flow hedges Foreign currency contracts (long) 2013 EUR	Mar. 31, 2013 Derivatives designated as hedging instruments Fair value hedges USD ($)	Mar. 31, 2013 Derivatives designated as hedging instruments Fair value hedges Commodity contract inventory (long) 2013 BBL USD ($)	Mar. 31, 2013 Derivatives designated as hedging instruments Fair value hedges Commodity contract inventory (short) 2013 BBL USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Commodity contract (long) 2013 BBL USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Commodity contract (long) 2014 BBL USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Commodity contract (long) 2015 BBL USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Commodity contract (short) 2013 BBL USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Commodity contract (short) 2014 BBL USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Commodity contract (short) 2015 BBL	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 AUD USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 AUD	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 BRL USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 BRL	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 CAD USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 CAD	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 CLP USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 CLP	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 COP USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 COP	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 DKK USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 DKK	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 EUR USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 EUR EUR (€)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 GBP USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 GBP GBP (£)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 JPY USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 JPY JPY (¥)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 MXN USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 MXN	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 NOK USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 NOK	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 PLN USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 PLN	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 SGD USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 SGD	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2014 GBP USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2014 GBP GBP (£)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 AUD USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 AUD	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 CAD USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 CAD	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 CLP USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 CLP	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 COP USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 COP	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 DKK USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 DKK	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 EUR USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 EUR EUR (€)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 GBP USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 GBP GBP (£)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 INR USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 INR	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 JPY USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 JPY JPY (¥)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 MXN USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 MXN	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 NOK USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 NOK	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 PLN USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 PLN	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 RON USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 RON	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 SGD USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 SGD	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 ZAR USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 ZAR	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2014 GBP USD ($)	Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2014 GBP GBP (£)
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts	1,290,000	1,290,000		344,000	1,969,000		38,792,000	892,000	26,000	28,789,000	870,000	32,000
Weighted Average Fixed Price of cash flow hedge commodity contracts	0.81
Weighted Average Mark-to-Market Amount of cash flow hedge commodity contracts	0.05
Fair value of cash flow hedge commodity contracts	$ 58
Weighted Average Fixed Price of fair value hedge commodity contracts				123.50	124.88
Weighted Average Mark-to-Market Amount of fair value hedge commodity contracts				0.42	(0.15)
Fair value hedge commodity contracts				146	(305)
Weighted Average Fixed Price of non-designated commodity contracts							73.58	78.21	115.68	88.44	77.22	113.77
Weighted Average Mark-to-Market Amount of non-designated commodity contracts							0.88	3.10	0.58	(0.87)	(3.10)
Fair value of non-designated commodity contracts							33,977	2,765	15	(25,070)	(2,693)
Non-Designated, Notional amount of foreign currency contracts														22,007		412		71,669		2,598,733		48,270,679		39,638		17,069		136,493		110,038		1,586,573		14,700		3,856		27,737		250		32,427		79,647		1,163,807		42,162,424		25,010		34,160		193,282		111,367		210,921		1,471,020		16,367		9,160		8,533		26,490		30,264		4,290
Weighted Average Fixed Price of non-designated foreign currency contracts													1.04		2.02		1.01		474.79		1,800.41		5.68		0.76		0.64		84.51		12.75		5.67		3.22		1.23		0.62		1.03		1.01		479.85		1,804.60		5.72		0.76		0.64		54.73		86.79		12.78		5.66		3.17		3.42		1.24		9.12		0.64
Weighted Average Mark-to-Market Amount of non-designated foreign currency contracts													0.01		0.01		(0.01)		0.00		0.00		0.00		(0.03)		(0.04)		0.00		0.00		(0.01)		(0.01)		0.00		(0.10)		(0.01)		0.01		0.00		0.00		0.00		0.03		0.04		0.00		0.00		0.00		0.01		0.01		0.00		0.00		0.00		0.06
Mark-to-Market value of non-designated foreign currency contracts													130		5		(1,036)		22		(475)		(141)		(463)		(4,982)		(32)		3,919		(92)		(25)		(76)		(24)		(190)		843		(37)		361		53		943		8,060		(4)		166		(3,450)		103		76		(5)		121		15		274
Mark-to-Market, Total			$ (159)			$ 13,053