Risk Management Activities and Fair Value Measurements - Fair Value (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 1,599		$ 1,604
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	26,510		22,671
Fair Value, Measurements, Recurring [Member] | 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	6	[1]	23	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	0	[2]	0	[2]
Fair Value, Measurements, Recurring [Member] | 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	26,510	[3]	22,671	[3]
Fair Value, Measurements, Recurring [Member] | 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, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	6		23
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | 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, Measurements, Recurring [Member] | 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
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0	[4]	0	[4]
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	1,781		3,171
Fair Value, Measurements, Recurring [Member] | 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	2,081	[1]	2,182	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	131	[2]	149	[2]
Fair Value, Measurements, Recurring [Member] | 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	1,650	[3]	3,022	[3]
Fair Value, Measurements, Recurring [Member] | 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	1,570		1,571
Fair Value, Measurements, Recurring [Member] | 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, Measurements, Recurring [Member] | 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	199		168
Fair Value, Measurements, Recurring [Member] | 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	45	[4]	19	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	77	[4]	90	[4]
Fair Value, Measurements, Recurring [Member] | 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	152		191
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	54	[4]	59	[4]
Fair Value, Measurements, Recurring [Member] | 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	115		233
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	0		0
Fair Value, Measurements, Recurring [Member] | 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	24	[1]	24	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	0	[2]	0	[2]
Fair Value, Measurements, Recurring [Member] | 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, Measurements, Recurring [Member] | 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, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Investment securities	24		24
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | 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, Measurements, Recurring [Member] | 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
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0	[4]	0	[4]
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	28,291		25,842
Fair Value, Measurements, Recurring [Member] | 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	2,111	[1]	2,229	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	131	[2]	149	[2]
Fair Value, Measurements, Recurring [Member] | 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	28,160	[3]	25,693	[3]
Fair Value, Measurements, Recurring [Member] | 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	1,570		1,571
Fair Value, Measurements, Recurring [Member] | 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	30		47
Fair Value, Measurements, Recurring [Member] | 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	199		168
Fair Value, Measurements, Recurring [Member] | 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	45	[4]	19	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	77	[4]	90	[4]
Fair Value, Measurements, Recurring [Member] | 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	152		191
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	54	[4]	59	[4]
Fair Value, Measurements, Recurring [Member] | 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	$ 115		$ 233

[1] All derivative assets are presented in prepaid expenses and other current assets and other noncurrent assets. Investment securities are presented in available-for-sale investment securities and other noncurrent assets. The U.S government securities are included in other noncurrent assets in our Consolidated Balance Sheet at June 30, 2013. The amortized cost of the U.S. government securities was $1,599 as of March 31, 2014 and $1,604 as of June 30, 2013. All U.S. government securities have contractual maturities between one and five years. Fair values are generally estimated based upon quoted market prices for similar instruments.

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

[3] Long-term debt includes the current portion ($5,258 and $4,540 as of March 31, 2014 and June 30, 2013, 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.