Commercial Paper, Current Borrowing Capacity

No definition available.

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- Definition

Consolidated Leverage Ratio

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Prior Borrowing Capacity

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Long-Term Line of Credit, Amount Outstanding

+ References

No definition available.

+ Details

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- Definition

Maximum ratio of consolidated total funded debt to consolidated capitalization

+ References

No definition available.

+ Details

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- Definition

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.

+ 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)(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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13)(2))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

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Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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Credit Facilities and Restrictive Covenants (Details) CAD in Millions, $ in Millions			12 Months Ended
	Jun. 16, 2017 CAD	Jan. 26, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD	Dec. 31, 2016 USD ($)	Nov. 26, 2014 USD ($)
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount			$ 107
Remaining borrowing capacity			4,528
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Prior Borrowing Capacity		$ 4,000
Line of Credit Facility, Current Borrowing Capacity		$ 5,000
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Commercial Paper, Current Borrowing Capacity						$ 4,000
Debt Instrument, Term		270 days
Commercial Paper			$ 240
LIBOR Alternate Base Rate [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.125%
LIBOR Alternate Base Rate [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.00%
For the Period Ended on or prior to December 31, 2017 [Member] \| Restrictive covenant [Member]
Line of Credit Facility [Line Items]
Consolidated Leverage Ratio			6.50
For the Period Ended After December 31, 2017 and on or prior to December 31, 2018 [Member] \| Restrictive covenant [Member]
Line of Credit Facility [Line Items]
Consolidated Leverage Ratio			6.25
For the Period Ended After December 31,2018 [Member] \| Restrictive covenant [Member]
Line of Credit Facility [Line Items]
Consolidated Leverage Ratio			6.00
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.125%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.00%
Federal Funds Rate [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.50%
Eurodollar [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.00%
Kinder Morgan, Inc. \| Commercial Paper [Member]
Line of Credit Facility [Line Items]
Commercial Paper			$ 240		$ 0
Kinder Morgan, Inc. \| Senior unsecured revolving credit facility due 2019 [Member]
Line of Credit Facility [Line Items]
Long-Term Line of Credit, Amount Outstanding			125
Long-term Line of Credit			125		$ 0
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount			$ 42	CAD 53.0
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Revolving Construction Facility [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit \| CAD	CAD 4,000.0
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Increase in Rates and Fees by .25% upon Fourth Anniversary of the Credit Facility			0.25%
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Revolving Contingent Credit Facility [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit \| CAD	1,000.0
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Revolving Working Capital Facility [Member]
Line of Credit Facility [Line Items]
Long-Term Line of Credit, Amount Outstanding \| CAD				0.0
Remaining borrowing capacity \| CAD				CAD 447.0
Long-term Line of Credit \| CAD	CAD 500.0
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.30%
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Minimum [Member] \| Revolving Working Capital Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.625%
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Maximum [Member] \| Revolving Working Capital Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.50%
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	5 years
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Credit Risk [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.50%
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| Credit Risk [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.50%
Revolving Credit Facility [Member] \| Kinder Morgan Cochin ULC and Trans Mountain Pipeline ULC [Member]
Line of Credit Facility [Line Items]
Maximum ratio of consolidated total funded debt to consolidated capitalization	70.00%