Risk Management Activities and Fair Value Measurements - Fair Value (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Jun. 30, 2012
Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	$ 23,246		$ 25,829
Fair Value, Inputs, Level 1 [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets recorded at fair value	14	[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	23,246	[3]	25,829	[3]
Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	0		0
Fair Value, Inputs, Level 1 [Member] | Other Investments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	14		9
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange 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 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	3,136		2,305
Fair Value, Inputs, Level 2 [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets recorded at fair value	2,195	[1]	419	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	91	[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	3,045	[3]	2,119	[3]
Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	1,509		0
Fair Value, Inputs, Level 2 [Member] | Other Investments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	0		0
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	140		0
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		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	35	[4]	86	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	90	[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	260		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	251		32
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		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	0		3
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	1		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]
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] | US Treasury and Government [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	0		0
Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	25		24
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange 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 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	26,382		28,134
Estimate of Fair Value, Fair Value Disclosure [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets recorded at fair value	2,234	[1]	452	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	91	[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	26,291	[3]	27,948	[3]
Estimate of Fair Value, Fair Value Disclosure [Member] | US Treasury and Government [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	1,509		0
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Investments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	39		33
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative assets	140		0
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		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	35	[4]	86	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	90	[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	260		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	251		32
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		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	0		3
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	$ 1		$ 2

[1] Investment securities and all derivative assets are presented in prepaid expenses and other current assets and other noncurrent assets. The amortized cost of the U.S. government securities was $1,504 and $0 as of March 31, 2013 and June 30, 2012, respectively. All U.S. government securities have contractual maturities between one and five years.

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

[3] Long-term debt includes the current portion ($2,513 and $4,095 as of March 31, 2013 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.