v2.4.0.6

Debt Credit Facilities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 LinesofCredit | Dec. 31, 2012
--- | --- | ---
KMI [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | $ 1,750 |
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced | 1,351 |
Line of Credit Facility, Amount Outstanding | 1,274 | 1,035
Number of lines of credit outstanding | 15 |
KMI [Member] | Secured credit facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Amount Outstanding | 1,274 |
KMI [Member] | Credit facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Amount Outstanding | 77 |
Kinder Morgan Energy Partners, L.P. [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | 2,200 |
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced | 805 |
Number of letters of credit | 3 |
Remaining borrowing capacity | 1,395 |
Kinder Morgan Energy Partners, L.P. [Member] | Commercial Paper [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced | 595 |
Kinder Morgan Energy Partners, L.P. [Member] | Letters of credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced | 210 |
Kinder Morgan Energy Partners, L.P. [Member] | Amended and Retated Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | 2,700 |
El Paso Pipeline Partners Operating Company, L.L.C. [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | 1,000 |
El Paso Pipeline Partners Operating Company, L.L.C. [Member] | Letters of credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced | 10 |
Supports certain proceedings with the California Public Utilities Commission [Member] | Kinder Morgan Energy Partners, L.P. [Member] | Letters of credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced | 100 |
Support tax-exempt bonds [Member] | Kinder Morgan Energy Partners, L.P. [Member] | Letters of credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced | 85 |
Supporting other obligations of KMP and its subsidiaries [Member] | Kinder Morgan Energy Partners, L.P. [Member] | Letters of credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced | $ 25 |

X
- Definition Line of Credit Facility, Amount Current Borrowing Capacity is Reduced + References No definition available. + Details
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Namespace Prefix: | kmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of Letters of Credit + References No definition available. + Details
Name: | kmi_NumberOfLettersOfCredit
Namespace Prefix: | kmi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Lines of Credit Outstanding + References No definition available. + Details
Name: | kmi_NumberOfLinesOfCreditOutstanding
Namespace Prefix: | kmi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant