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Debt Current Portion of Debt (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 16, 2018
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 3,388 | $ 2,828 |  |
Debt, Weighted Average Interest Rate |  | 5.15% | 5.02% |  |
Repayments of debt |  | $ 14,591 | $ 11,064 | $ 10,060 |
$500 million, 364-day credit facility due November 15, 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | 0 | 0 |  |
$4 billion credit facility due November 16, 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | 0 | 0 |  |
$5 billion, five-year credit facility due November 26, 2019, -% and 2.99%, respectively |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 0 | $ 125 |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  | $ 5,000
Debt, Weighted Average Interest Rate |  | 0.00% | 2.99% |  |
Commercial paper notes, 3.10% and 2.02%, respectively |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 433 | $ 240 |  |
Debt, Weighted Average Interest Rate |  | 3.10% | 2.02% |  |
KML 2018 Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 0 | $ 0 |  |
KML 2018 Credit Facility | Canada, Dollars |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Foreign Currency Exchange Rate, Translation |  | 0.7330 | 0.7971 |  |
6.00%, due January 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 0 | $ 750 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.00% | 6.00% |  |
7.00%, due February 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 0 | $ 82 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.00% | 7.00% |  |
5.95%, due February 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 0 | $ 975 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.95% | 5.95% |  |
7.25%, due June 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 0 | $ 477 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.25% | 7.25% |  |
9.00%, due February 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 500 | $ 0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 9.00% | 9.00% |  |
9.00%, due February 2019 | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt | $ 500 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 9.00% |  |  |  |
2.65%, due February 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 800 | $ 0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.65% | 2.65% |  |
2.65%, due February 2019 | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt | $ 800 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.65% |  |  |  |
3.05%, due December 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 1,500 | $ 0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.05% | 3.05% |  |
Trust I Preferred Securities, 4.75%, due March 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 111 | $ 111 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.75% |  |  |
Current portion - Other debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of debt |  | $ 44 | $ 68 |  |

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