Risk Management Activities and Fair Value Measurements - Fair Value (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Jun. 30, 2013
Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	$ 26,275		$ 22,671
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	8	[1]	23	[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	26,275	[3]	22,671	[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	8		23
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
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0	[4]	0	[4]
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 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	3,819		3,171
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	2,093	[1]	2,182	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	193	[2]	149	[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	3,626	[3]	3,022	[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	1,574		1,571
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	219		168
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		0
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	31	[4]	19	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	76	[4]	90	[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	136		191
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	117	[4]	59	[4]
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	133		233
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		0
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
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0	[4]	0	[4]
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
Estimate of Fair Value, Fair Value Disclosure [Member]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded & not recorded at fair value	30,094		25,842
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	2,126	[1]	2,229	[1]
Liabilities, Fair Value Disclosure [Abstract]
Liabilities recorded at fair value	193	[2]	149	[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	29,901	[3]	25,693	[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	1,574		1,571
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	33		47
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	219		168
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0		0
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	31	[4]	19	[4]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	76	[4]	90	[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	136		191
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	117	[4]	59	[4]
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	133		233
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	$ 0		$ 0

[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 $1,604 as of December 31, 2013 and 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 ($6,521 and $4,540 as of December 31, 2013 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.