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| In millions, except per share items | Sep-30-14 | Jun-30-14 | Mar-31-14 | Dec-31-13 | Sep-30-13 | Jun-30-13 | Mar-31-13 | Dec-31-12 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Assets [Abstract] | | | | | | | | |
| Current assets: | | | | | | | | |
| Cash and cash equivalents | 110.0 | 716.0 | 535.0 | 102.0 | 64.0 | 118.0 | 79.0 | 20.0 |
| Trade accounts and notes receivable, net | 613.0 | 544.0 | 570.0 | 523.0 | 472.0 | 521.0 | 600.0 | 562.0 |
| Inventories | 284.0 | 276.0 | 222.0 | 193.0 | 225.0 | 174.0 | 188.0 | 173.0 |
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| Regulatory assets | | | | | | | | |
| Other current assets | 183.0 | 182.0 | 85.0 | 96.0 | 71.0 | 71.0 | 35.0 | 95.0 |
| Total current assets | 1,190.0 | 1,718.0 | 1,412.0 | 914.0 | 864.0 | 929.0 | 952.0 | 850.0 |
| Investments | 2,374.0 | 2,375.0 | 2,381.0 | 2,187.0 | 2,113.0 | 1,955.0 | 1,871.0 | 1,800.0 |
| Property, plant, and equipment, at cost | 27,382.0 | 26,602.0 | 25,789.0 | 23,774.0 | 23,021.0 | 22,236.0 | 21,623.0 | 21,062.0 |
| Accumulated depreciation | -7,905.0 | -7,752.0 | -7,592.0 | 7,286.0 | -7,147.0 | -7,020.0 | -6,891.0 | 6,775.0 |
| Property, plant, and equipment - net | 19,477.0 | 18,850.0 | 18,197.0 | 16,488.0 | 15,874.0 | 15,216.0 | 14,732.0 | 14,287.0 |
| Goodwill | 646.0 | 646.0 | 646.0 | 646.0 | 646.0 | 646.0 | 646.0 | 649.0 |
| Other intangible assets, net of amortization | 1,600.0 | 1,614.0 | 1,630.0 | 1,642.0 | 1,657.0 | 1,672.0 | 1,687.0 | 1,702.0 |
| Regulatory assets, deferred charges, and other | 527.0 | 535.0 | 525.0 | 481.0 | 479.0 | 472.0 | 404.0 | 421.0 |
| Total assets | 25,814.0 | 25,738.0 | 24,791.0 | 22,358.0 | 21,633.0 | 20,890.0 | 20,292.0 | 19,709.0 |
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| Liabilities [Abstract] | | | | | | | | |
| Current liabilities: | | | | | | | | |
| Accounts payable: | | | | | | | | |
| Trade | 893.0 | 945.0 | 1,062.0 | 828.0 | 887.0 | 856.0 | 862.0 | 851.0 |
| Affiliate | 89.0 | 139.0 | 77.0 | 93.0 | 88.0 | 118.0 | 94.0 | 117.0 |
| Accrued interest | 146.0 | 137.0 | 132.0 | 115.0 | 108.0 | 109.0 | 108.0 | 110.0 |
| Asset retirement obligations | 34.0 | 68.0 | 63.0 | 63.0 | 56.0 | 73.0 | 80.0 | 68.0 |
| Other accrued liabilities | 248.0 | 226.0 | 252.0 | 370.0 | 309.0 | 278.0 | 229.0 | 203.0 |
| Long-term debt due within one year | 750.0 | 750.0 | 750.0 | | | | | |
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| Commercial paper | | | | | | | | |
| Total current liabilities | 2,425.0 | 2,265.0 | 2,336.0 | 1,694.0 | 1,819.0 | 2,144.0 | 1,373.0 | 1,349.0 |
| Long-term debt | 11,048.0 | 11,047.0 | 9,803.0 | 9,057.0 | 8,063.0 | 8,063.0 | 8,312.0 | 8,437.0 |
| Asset retirement obligations | 651.0 | 535.0 | 532.0 | 491.0 | 504.0 | 518.0 | 502.0 | 508.0 |
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| Regulatory liabilities, deferred income, and other | | | | | | | | |
| Contingent liabilities (Note 10) | | | | | | | | |
| Equity: | | | | | | | | |
| Partners' equity | | | | | | | | |
| Common units (439 | 10,834.0 | 11,150.0 | 11,494.0 | 11,596.0 | 11,823.0 | 10,825.0 | 11,038.0 | 10,372.0 |
| Class D units (26,475,507 units outstanding at September 30, 2014) | 884.0 | | | | | | | |
| General partner | -1,502.0 | -1,498.0 | -1,494.0 | -1,451.0 | -1,451.0 | -1,471.0 | -1,470.0 | -1,487.0 |
| Accumulated other comprehensive income (loss) | 43.0 | 96.0 | 58.0 | -1.0 | | -1.0 | -2.0 | -2.0 |
| Total partners' equity | 10,259.0 | 10,614.0 | 10,937.0 | 10,144.0 | 10,372.0 | 9,353.0 | 9,566.0 | 8,883.0 |
| Noncontrolling interests in consolidated subsidiaries | 624.0 | 533.0 | 472.0 | 415.0 | 316.0 | 266.0 | 16.0 | 14.0 |
| Total equity | 10,883.0 | 11,147.0 | 11,409.0 | 10,559.0 | 10,688.0 | 9,619.0 | 9,582.0 | 8,897.0 |
| Total liabilities and equity | 25,814.0 | 25,738.0 | 24,791.0 | 22,358.0 | 21,633.0 | 20,890.0 | 20,292.0 | 19,709.0 |
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