Financial Instruments (Narrative) (Details) - Interest Rate Swap - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015	Nov. 30, 2014
Fair Value Hedging
Derivative [Line Items]
Derivative, notional amount	$ 1,963	$ 1,613
Cash Flow Hedging
Derivative [Line Items]
Derivative, notional amount	300
Designated as Hedging Instrument | Fair Value Hedging
Derivative [Line Items]
Derivative, notional amount	600	1,050
Derivatives, terminated notional amounts	250	875
Designated as Hedging Instrument | Fair Value Hedging | Debt Offering
Derivative [Line Items]
Derivative, notional amount		250	$ 450
Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Derivative, notional amount	$ 300	850
Derivatives, terminated notional amounts		$ 1,150