v2.4.0.6

Risk Management Credit Risks (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Credit Derivatives [Line Items] |  |
Netting agreement impact | $ (33) | $ (38)
Letters of credit outstanding, amount | 160 | 288
External Credit Rating, Investment Grade [Member] |  |
Credit Derivatives [Line Items] |  |
Margin Deposit Assets | 21 | 5
Asset position | 657 |
Netting agreement impact | (33) |
Cash collateral held | 0 |
Net exposure | 624 |
Interest Rate Swap [Member] | External Credit Rating, Investment Grade [Member] |  |
Credit Derivatives [Line Items] |  |
Asset position | 579 |
Commodity Contract [Member] | External Credit Rating, Investment Grade [Member] |  |
Credit Derivatives [Line Items] |  |
Asset position | 78 |
KMI [Member] | Commodity [Member] |  |
Credit Derivatives [Line Items] |  |
Letters of credit outstanding, amount | 300 |
Kinder Morgan Energy Partners, L.P. [Member] |  |
Credit Derivatives [Line Items] |  |
Margin Deposit Assets | 21 | 5
Kinder Morgan Energy Partners, L.P. [Member] | External Credit Rating, Non Investment Grade [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral liability, down graded two notches results in margin deposits held by counterparties | $ 13 |

X
- Definition Collateral Held, Credit Risk Derivatives + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Collateral Liability, Down Graded Two Notches Results in Margin Deposits Held by Counterparties + References No definition available. + Details
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- Definition Net Exposure on Credit Risk Derivatives + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Netting Agreement Impact, Credit Risk Derivatives + References No definition available. + Details
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Namespace Prefix: | kmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + 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 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum amount the entity would be obligated to pay on the credit risk derivatives upon occurrence of a credit event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A, 15B, 15C, 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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