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Credit Facilities and Restrictive Covenants (Details) $ in Millions, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | Aug. 31, 2018 CAD ($) | May 30, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 CAD ($) | Nov. 16, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 14,591 | $ 11,064 | $ 10,060 |  |
$5 billion, five-year credit facility due November 26, 2019, -% and 2.99%, respectively |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  | $ 5,000
$4 billion credit facility due November 16, 2023 |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  | 4,000
$4 billion credit facility due November 16, 2023 | Minimum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  | 0.10% |  |  |  |
$4 billion credit facility due November 16, 2023 | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  | 0.30% |  |  |  |
$500 million, 364-day credit facility due November 15, 2019 |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  | $ 500
$500 million, 364-day credit facility due November 15, 2019 | Minimum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  | 0.09% |  |  |  |
$500 million, 364-day credit facility due November 15, 2019 | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  | 0.28% |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commercial Paper, Current Borrowing Capacity |  |  |  | $ 4,000 |  |  |  |
Debt Instrument, Term |  |  |  | 270 days |  |  |  |
364-day Due 2019 And 5-year Due 2023 Senior Unsecured Revolving Credit Facilities [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum ratio of consolidated total funded debt to consolidated earnings before interest income taxes DDA |  |  |  | 5.50 |  |  | 5.50 |
Letters of Credit Outstanding, Amount |  |  |  | $ 99 |  |  |  |
Remaining borrowing capacity |  |  |  | $ 3,968 |  |  |  |
364-day Due 2019 And 5-year Due 2023 Senior Unsecured Revolving Credit Facilities [Member] | LIBOR Alternate Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.10% |  |  |  |
364-day Due 2019 And 5-year Due 2023 Senior Unsecured Revolving Credit Facilities [Member] | LIBOR Alternate Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.00% |  |  |  |
364-day Due 2019 And 5-year Due 2023 Senior Unsecured Revolving Credit Facilities [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.00% |  |  |  |
364-day Due 2019 And 5-year Due 2023 Senior Unsecured Revolving Credit Facilities [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.00% |  |  |  |
364-day Due 2019 And 5-year Due 2023 Senior Unsecured Revolving Credit Facilities [Member] | Federal Funds Rate [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.50% |  |  |  |
364-day Due 2019 And 5-year Due 2023 Senior Unsecured Revolving Credit Facilities [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.00% |  |  |  |
KML 2018 Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | $ 367 |  |  | $ 500 |
Maximum ratio of consolidated total funded debt to consolidated earnings before interest income taxes DDA |  |  |  | 5.00 |  |  | 5.00 |
Letters of Credit Outstanding, Amount |  |  |  | $ 8 |  |  | $ 11 |
Remaining borrowing capacity |  |  |  | $ 359 |  |  | 489 |
KML 2018 Credit Facility | Backstop letter of credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  | $ 8 |
KML 2018 Credit Facility | Minimum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  | 0.20% |  |  |  |
KML 2018 Credit Facility | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  | 0.45% |  |  |  |
KML 2018 Credit Facility | Bankers Acceptance [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.00% |  |  |  |
KML 2018 Credit Facility | Bankers Acceptance [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.25% |  |  |  |
KML 2018 Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.00% |  |  |  |
KML 2018 Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.25% |  |  |  |
KML 2018 Credit Facility | Prime Rate [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.25% |  |  |  |
KML 2018 Credit Facility | US bank rate loans [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.25% |  |  |  |
KML Temporary Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Repayments of Debt | $ 102 | $ 133 |  |  |  |  |  |
KML 2017 Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Repayments of Debt |  |  | $ 100 |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  | $ 46 |  |  |  |
Commercial Paper [Member] | 364-day Due 2019 And 5-year Due 2023 Senior Unsecured Revolving Credit Facilities [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commercial Paper |  |  |  | $ 433 |  |  |  |

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