Increase in Rates and Fees by .25% upon Fourth Anniversary of the Credit Facility

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Long-Term Line of Credit, Amount Outstanding

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Maximum ratio of consolidated total funded debt to consolidated capitalization

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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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)(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Debt Credit Facilities (Details) CAD in Millions, $ in Millions		9 Months Ended
	Jun. 16, 2017 CAD	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
KMI
Line of Credit Facility [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity		$ 4,830.0
Line of Credit Facility, Current Borrowing Capacity		5,000.0
Letters of Credit Outstanding, Amount		110.0
Revolving Construction Facility [Member]
Line of Credit Facility [Line Items]
Long-Term Line of Credit, Amount Outstanding		132.0
Revolving Construction Facility [Member] \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit \| CAD	CAD 4,000
Commercial Paper [Member] \| KMI
Line of Credit Facility [Line Items]
Commercial paper borrowings		60.0	$ 0.0
Revolving Contingent Credit Facility [Member] \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit \| CAD	1,000
Revolving Working Capital Facility [Member]
Line of Credit Facility [Line Items]
Long-Term Line of Credit, Amount Outstanding		$ 0.0
Revolving Working Capital Facility [Member] \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit \| CAD	CAD 500
KML Credit Facility(c) \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Increase in Rates and Fees by .25% upon Fourth Anniversary of the Credit Facility		0.25%
KML Credit Facility(c) \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	5 years
Minimum [Member] \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.30%
Minimum [Member] \| Revolving Working Capital Facility [Member] \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Maximum [Member] \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.625%
Maximum [Member] \| Revolving Working Capital Facility [Member] \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.50%
KML Credit Facility(c) \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Ratio of Indebtedness to Net Capital	70.00%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member] \| KML Credit Facility(c) \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| KML Credit Facility(c) \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.50%
Credit Risk [Member] \| Minimum [Member] \| KML Credit Facility(c) \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Credit Risk [Member] \| Maximum [Member] \| KML Credit Facility(c) \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%