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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% |  |  |  |  |

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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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- 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 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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- 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 + Details
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- 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 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 + Details
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