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Financial Instruments (Narrative) (Details) - Interest Rate Swap - USD ($) $ in Millions | Jun. 30, 2017 | Jun. 30, 2016
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Fair Value Hedging |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 1,813 | $ 1,963
Cash Flow Hedging |  |
Derivative [Line Items] |  |
Derivative, notional amount |  | 300
Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative [Line Items] |  |
Derivative, notional amount | 700 | 600
Derivatives, terminated notional amounts | 600 | 250
Derivatives, matured notional amounts | 250 |
Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Derivative, notional amount | 700 | $ 300
Derivatives, terminated notional amounts | $ 1,000 |
Derivative Asset, Number of Instruments Held | 0 |

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