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Financial and Derivative Instruments (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
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Jun. 30, 2011
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Jun. 30, 2010
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Jun. 30, 2011
cubicFeet
gal
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Jun. 30, 2010
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Dec. 31, 2010
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| Estimated fair value of total long-term debt including capitalized lease obligations | $ 12,600,000,000 | $ 12,600,000,000 | $ 12,800,000,000 | ||
| Recorded book values of total long-term debt including capitalized lease obligations | 12,123,000,000 | 12,123,000,000 | 12,227,000,000 | ||
| Derivative assets at fair value, net | 155,000,000 | 155,000,000 | 172,000,000 | ||
| Gain (loss) before-tax earnings impact of derivatives | 39,000,000 | 24,000,000 | 59,000,000 | 33,000,000 | |
| Volume (Cubic feet daily) | 250,000,000 | ||||
| Weighted average NYMEX price (per thousand cubic feet) | $ 7.02 | ||||
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Cash Flow Hedge [Member]
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| Derivative assets at fair value, net | 114,000,000 | 114,000,000 | |||
| Gain (loss) before-tax earnings impact of derivatives | $ 56,000,000 | ||||