Financial Instruments (Schedule of Gain/(Loss) Recognized in Earnings for Interest Rate Contracts Designated as Fair Value Hedges) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Derivative [Line Items]
Fair value adjustment related to previously terminated swaps	$ 22		$ 22
Fair Value Hedging | Interest Rate Swaps | Interest Expense, Net
Derivative [Line Items]
Gain/(loss) on derivative		$ 23	14	$ 23
Fair Value Hedging | Fixed-Rate Debt | Interest Expense, Net
Derivative [Line Items]
Gain/(loss) on derivative		$ (23)	$ (14)	$ (23)