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| In millions, except per share items | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 | Dec-31-08 | Dec-31-07 | Dec-31-06 |
| | 10-K | 10-K | 10-K | 10-K/A | 10-K/A | 10-K | 10-K | 10-K |
| Assets [Abstract] | | | | | | | | |
| Current assets: | | | | | | | | |
| Cash and cash equivalents | 102.0 | 20.0 | 163.0 | 187.0 | | | | |
| Trade accounts and notes receivable, net | 523.0 | 562.0 | 564.0 | 404.0 | | | | |
| Inventories | 193.0 | 173.0 | 169.0 | 195.0 | | | | |
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| Regulatory assets | | | | | | | | |
| Other current assets | 96.0 | 95.0 | 72.0 | 53.0 | | | | |
| Total current assets | 914.0 | 850.0 | 1,008.0 | 1,799.0 | | | | |
| Investments | 2,187.0 | 1,800.0 | 1,383.0 | | | | | |
| Property, plant, and equipment, at cost | 23,774.0 | 21,062.0 | 18,060.0 | 16,707.0 | | | | |
| Accumulated depreciation | 7,286.0 | 6,775.0 | 6,238.0 | 5,706.0 | | | | |
| Property, plant, and equipment - net | 16,488.0 | 14,287.0 | 11,822.0 | 11,001.0 | | | | |
| Goodwill | 646.0 | 649.0 | | | | | | |
| Other intangible assets, net of amortization | 1,642.0 | 1,702.0 | 43.0 | | | | | |
| Regulatory assets, deferred charges, and other | 481.0 | 421.0 | 416.0 | 460.0 | | | | |
| Total assets | 22,358.0 | 19,709.0 | 14,672.0 | 13,404.0 | | | | |
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| Liabilities [Abstract] | | | | | | | | |
| Current liabilities: | | | | | | | | |
| Accounts payable: | | | | | | | | |
| Trade | 828.0 | 851.0 | 623.0 | 322.0 | | | | |
| Affiliate | 93.0 | 117.0 | 68.0 | 154.0 | | | | |
| Accrued interest | 115.0 | 110.0 | 105.0 | 105.0 | | | | |
| Asset retirement obligations | 63.0 | 68.0 | 66.0 | 35.0 | | | | |
| Other accrued liabilities | 370.0 | 203.0 | 172.0 | 139.0 | | | | |
| Long-term debt due within one year | | | 324.0 | 458.0 | | | | |
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| Commercial paper | | | | | | | | |
| Total current liabilities | 1,694.0 | 1,349.0 | 1,358.0 | 1,213.0 | | | | |
| Long-term debt | 9,057.0 | 8,437.0 | 6,913.0 | 6,365.0 | | | | |
| Asset retirement obligations | 491.0 | 508.0 | 504.0 | 460.0 | | | | |
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| Regulatory liabilities, deferred income, and other | | | | | | | | |
| Contingent liabilities (Note 10) | | | | | | | | |
| Equity: | | | | | | | | |
| Partners' equity | | | | | | | | |
| Common units (439 | 11,596.0 | 10,372.0 | 6,810.0 | 6,564.0 | | | | |
| General partner | -1,451.0 | -1,487.0 | -1,375.0 | -1,485.0 | | | | |
| Accumulated other comprehensive income (loss) | -1.0 | -2.0 | -2.0 | -3.0 | | | | |
| Total partners' equity | 10,144.0 | 8,883.0 | 5,433.0 | 5,076.0 | | | | |
| Noncontrolling interests in consolidated subsidiaries | 415.0 | 14.0 | | | | | | |
| Total equity | 10,559.0 | 8,897.0 | 5,433.0 | 5,076.0 | | | | |
| Total liabilities and equity | 22,358.0 | 19,709.0 | 14,672.0 | 13,404.0 | | | | |
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