Risk Management Activities and Fair Value Measurements - Fair Value (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Jun. 30, 2012
Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	$ 25,900		$ 25,829
Fair Value, Inputs, Level 1 [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	8		9
Total assets recorded at fair value	8	[1]	9	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	0	[2]	0	[2]
Fair Value, Inputs, Level 1 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Long-term Debt, Fair Value	25,900	[3]	25,829
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		0
Fair Value, Inputs, Level 1 [Member] | Other Foreign Currency Instruments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	0	[4]	0	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0	[4]	0	[4]
Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	0		0
Fair Value, Inputs, Level 1 [Member] | Net Investment Hedging [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	0		0
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		0
Fair Value, Inputs, Level 1 [Member] | Commodity Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	0		0
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		0
Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	3,778		2,305
Fair Value, Inputs, Level 2 [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	0		0
Total assets recorded at fair value	464	[1]	419	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	227	[2]	186	[2]
Fair Value, Inputs, Level 2 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Long-term Debt, Fair Value	3,551	[3]	2,119	[3]
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	162		142
Fair Value, Inputs, Level 2 [Member] | Other Foreign Currency Instruments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	113	[4]	86	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	24	[4]	23	[4]
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	338		298
Fair Value, Inputs, Level 2 [Member] | Net Investment Hedging [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	8		32
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	35		19
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	5		3
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	6		2
Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	0		0
Fair Value, Inputs, Level 3 [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	25		24
Total assets recorded at fair value	25	[1]	24	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	0	[2]	0	[2]
Fair Value, Inputs, Level 3 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Long-term Debt, Fair Value	0	[3]	0	[3]
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		0
Fair Value, Inputs, Level 3 [Member] | Other Foreign Currency Instruments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	0	[4]	0	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0	[4]	0	[4]
Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	0		0
Fair Value, Inputs, Level 3 [Member] | Net Investment Hedging [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	0		0
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		0
Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	0		0
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		0
Estimate of Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	29,678		28,134
Estimate of Fair Value, Fair Value Disclosure [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	33		33
Total assets recorded at fair value	497	[1]	452	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	227	[2]	186	[2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Long-term Debt, Fair Value	29,451	[3]	27,948	[3]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	162		142
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Foreign Currency Instruments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	113	[4]	86	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	24	[4]	23	[4]
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest Rate Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	338		298
Estimate of Fair Value, Fair Value Disclosure [Member] | Net Investment Hedging [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	8		32
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	35		19
Estimate of Fair Value, Fair Value Disclosure [Member] | Commodity Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	5		3
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	$ 6		$ 2

[1] Investment securities are presented in other noncurrent assets and all derivative assets are presented in prepaid expenses and other current assets or other noncurrent assets.

[2] All liabilities are presented in accrued and other liabilities or other noncurrent liabilities.

[3] Long-term debt includes the current portion ($2,920 and $4,095 as of September 30 and June 30, 2012, respectively) of debt instruments. Long term debt is not recorded at fair value on a recurring basis, but is measured at fair value for disclosure purposes. Fair values are generally estimated based on quoted market prices for identical or similar instruments.

[4] Other foreign currency instruments are comprised of foreign currency financial instruments that do not qualify as hedges.