Risk Management Activities and Fair Value Measurements - Gains (Losses) on Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2015		Mar. 31, 2014		Jun. 30, 2014
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net					$ 8				$ 17
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	10	[1]	(9)	[1]	141	[1]	50	[1]
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net					0				3
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2	[1]	2	[1]	5	[1]	5	[1]
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net					8				14
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	8	[1]	(11)	[1]	136	[1]	45	[1]
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0		0		0		(1)
Fair Value Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	25	[2]	80	[2]	108	[2]	(34)	[2]
Fair Value Hedging [Member] | Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(25)	[2]	(80)	[2]	(108)	[2]	33	[2]
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net					56				30
Derivative, Gain (Loss) on Derivative, Net	0		0		(1)	[2]	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (343)	[3]	$ 5	[3]	$ (1,072)	[3]	$ 88	[3]

[1] The gain or loss on the effective portion of cash flow hedging relationships is reclassified from AOCI into net income in the same period during which the related item affects earnings. Such amounts are included in the Consolidated Statements of Earnings as follows: interest rate contracts in Interest expense and foreign currency contracts in Selling, general and administrative expense (SG&A) and Interest expense.

[2] The gain or loss on the ineffective portion of interest rate contracts and net investment hedges, if any, is included in the Consolidated Statements of Earnings in Interest expense.

[3] The gain or loss on foreign currency contracts not designated as hedging instruments is included in the Consolidated Statements of Earnings in SG&A. This gain or loss substantially offsets the foreign currency mark-to-market impact of the related exposure.