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Reconciliation of Significant Asset Balances (Details) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| Debt Fair Value Adjustments | $ 2,449,000,000 | $ 2,591,000,000 |
| Cash and Cash Equivalents, at Carrying Value | 1,106,000,000 | 714,000,000 |
| Property, plant and equipment, net | 31,201,000,000 | 30,996,000,000 |
| Investments | 5,773,000,000 | 5,804,000,000 |
| Goodwill | 23,569,000,000 | 23,572,000,000 |
| Long-term Debt, Current Maturities | 2,876,000,000 | 2,401,000,000 |
| Long-term debt outstanding | 28,965,000,000 | 29,309,000,000 |
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KMI [Member]
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| Cash and Cash Equivalents, at Carrying Value | 164,000,000 | 71,000,000 |
| Property, plant and equipment, net | 2,717,000,000 | 2,735,000,000 |
| Goodwill | 18,135,000,000 | 18,133,000,000 |
| Long-term Debt, Current Maturities | 1,585,000,000 | 1,153,000,000 |
| Long-term debt outstanding | 7,954,000,000 | 9,148,000,000 |
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Kinder Morgan Energy Partners, L.P. [Member]
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| Cash and Cash Equivalents, at Carrying Value | 736,000,000 | 529,000,000 |
| Property, plant and equipment, net | 22,584,000,000 | 22,330,000,000 |
| Goodwill | 5,412,000,000 | 5,417,000,000 |
| Long-term Debt, Current Maturities | 1,127,000,000 | 1,155,000,000 |
| Long-term debt outstanding | 16,829,000,000 | 15,907,000,000 |
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El Paso Pipeline Partners, L.P. [Member]
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| Debt Fair Value Adjustments | 8,000,000 | |
| Cash and Cash Equivalents, at Carrying Value | 206,000,000 | 114,000,000 |
| Property, plant and equipment, net | 5,900,000,000 | 5,931,000,000 |
| Goodwill | 22,000,000 | 22,000,000 |
| Long-term Debt, Current Maturities | 164,000,000 | 93,000,000 |
| Long-term debt outstanding | $ 4,182,000,000 | $ 4,254,000,000 |
| X | ||||||||||
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- Definition
Fair value adjustments to debt as of the balance sheet date including fair value purchase accounting adjustments to debt and fair value of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet as well as unamortized portions of proceeds received from early termination of interest rate swap agreements. No definition available.
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| X | ||||||||||
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- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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