|
Risk Management Activities and Fair Value Measurements - Derivative Notional Amounts and Fair Value (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2014
|
Jun. 30, 2014
|
|---|---|---|
|
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
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| Derivative [Line Items] | ||
| Notional amount | $ 951 | $ 951 |
| Fair Value Asset (Liability) | 239 | 187 |
|
Fair Value Hedging [Member] | Interest Rate Contract [Member]
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||
| Derivative [Line Items] | ||
| Notional amount | 7,671 | 9,738 |
| Fair Value Asset (Liability) | 191 | 168 |
|
Net Investment Hedging [Member]
|
||
| Derivative [Line Items] | ||
| Notional amount | 838 | 831 |
| Fair Value Asset (Liability) | 103 | 48 |
|
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
|
||
| Derivative [Line Items] | ||
| Notional amount | 8,964 | 12,111 |
| Fair Value Asset (Liability) | $ (205) | $ (42) |