|
Derivative and Hedging Activities - Derivative Instruments Table (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Derivative [Line Items] | ||
| Fair Value | $ (755) | $ (551) |
|
Natural Gas [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Energy Measurement | 949,000,000,000,000 | 1,009,000,000,000,000 |
| Fair Value | (278) | (237) |
|
Natural Gas [Member] | Swap [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Energy Measurement | 293,000,000,000,000 | 448,000,000,000,000 |
| Fair Value | (75) | (23) |
|
Natural Gas [Member] | Three Way Collar [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Energy Measurement | 335,000,000,000,000 | 288,000,000,000,000 |
| Fair Value | (27) | (7) |
|
Natural Gas [Member] | Collar [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Energy Measurement | 22,000,000,000,000 | 0 |
| Fair Value | 4 | 0 |
|
Natural Gas [Member] | Call Option [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Energy Measurement | 193,000,000,000,000 | 193,000,000,000,000 |
| Fair Value | (195) | (210) |
|
Natural Gas [Member] | Swaption [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Energy Measurement | 0 | 12,000,000,000,000 |
| Fair Value | 0 | 0 |
|
Natural Gas [Member] | Basis Swap [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Energy Measurement | 106,000,000,000,000 | 68,000,000,000,000 |
| Fair Value | 15 | 3 |
|
Crude Oil [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Volume Measurement | 61,800,000 | 68,200,000 |
| Fair Value | (477) | (314) |
|
Crude Oil [Member] | Swap [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Volume Measurement | 18,300,000 | 25,300,000 |
| Fair Value | (146) | (50) |
|
Crude Oil [Member] | Three Way Collar [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Volume Measurement | 4,400,000 | 0 |
| Fair Value | (12) | 0 |
|
Crude Oil [Member] | Call Option [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Volume Measurement | 38,900,000 | 42,500,000 |
| Fair Value | (320) | (265) |
|
Crude Oil [Member] | Basis Swap [Member]
|
||
| Derivative [Line Items] | ||
| Volume, Volume Measurement | 200,000 | 400,000 |
| Fair Value | $ 1 | $ 1 |