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Derivative and Hedging Activities - Natural Gas and Oil Sales Table (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Natural gas, oil and NGL Sales | $ 1,704 | $ 2,406 | $ 3,471 | $ 3,858 |
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Natural Gas, Oil and NGL [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Natural gas, oil and NGL sales | 1,917 | 1,869 | 4,065 | 3,464 |
| Gains (losses) on undesignated natural gas, oil and NGL derivatives | (210) | 535 | (574) | 412 |
| Gains (losses) on terminated cash flow hedges | (3) | 2 | (20) | (18) |
| Natural gas, oil and NGL Sales | $ 1,704 | $ 2,406 | $ 3,471 | $ 3,858 |