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Litigation, Environmental and Other Contingencies Environmental Matters (Details) |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 240 Months Ended |  |
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May 04, 2018 USD ($) a | Oct. 05, 2016 USD ($) | Jun. 08, 2016 USD ($) | Dec. 18, 2015 USD ($) | Nov. 08, 2013 | Aug. 06, 2013 Defendants | Dec. 31, 2010 USD ($) Defendants | Dec. 31, 2000 Terminals | Dec. 31, 2018 USD ($) a Terminals mi Defendants Parties | Dec. 31, 1969 | Dec. 31, 2017 USD ($) | Jan. 06, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies |  |  |  |  |  |  |  |  | $ 271,000,000 |  | $ 279,000,000 |
Recorded Third-Party Environmental Recoveries Receivable |  |  |  |  |  |  |  |  | $ 13,000,000 |  | $ 13,000,000 |
Rare Metals Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Uranium Mines |  |  |  |  |  |  |  |  |  | 20 |  |
Environmental Protection Agency [Member] | Portland Harbor Superfund Site, Willamette River, Portland, Oregon [Member] | GATX Terminals Corporation (n/k/a KMLT) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated Remedy Implementation Period |  |  | 13 years |  |  |  |  |  |  |  |  |
Number of Liquid Terminals | Terminals |  |  |  |  |  |  |  | 2 | 4 |  |  |
Accrual for Environmental Loss Contingencies, Gross |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  | $ 1,100,000,000
Number of Parties Involoved In Site Cleanup | Parties |  |  |  |  |  |  |  |  | 90 |  |  |
Parish of Plaquemines, Louisiana [Member] | Bastian Bay, Buras, Empire and Fort Jackson oil and gas fields of Plaquemines Parish [Member] | TGP [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Defendants |  |  |  |  | 17 |  |  |  |  |  |  |
Roosevelt Irrigation District v. Kinder Morgan G.P., Inc., Kinder Morgan Energy Partners, L.P. , U.S. District Court, Arizona [Member] | Pending Litigation [Member] | SFPP Phoenix Terminal [Member] | Unfavorable Regulatory Action [Member] | KMEP and SFPP [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Defendants | Defendants |  |  |  |  |  | 26 | 70 |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |
Lower Passaic River Study Area | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Miles of river | mi |  |  |  |  |  |  |  |  | 17 |  |  |
Number of Parties at a Joint Defense Group |  |  |  |  |  |  |  |  | 44 |  |  |
Lower Passaic River Study Area, Lower Portion [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Miles of river | mi |  |  |  |  |  |  |  |  | 8 |  |  |
Vintage Assets Inc. [Member] | Parish of Plaquemines, Louisiana [Member] | TGP and SNG [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |
Restore acreage | a | 9.6 |  |  |  |  |  |  |  |  |  |  |
Percent of legal expenses reimbursed by current property owner |  |  |  | 50.00% |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ 1,104 |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  |  |  |  |  | 5,000 |  |  |
Minimum [Member] | Lower Passaic River Study Area | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Gross |  |  |  |  |  |  |  |  | $ 365,000,000 |  |  |
Maximum [Member] | Lower Passaic River Study Area | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Gross |  |  |  |  |  |  |  |  | $ 3,200,000,000 |  |  |
AOC required engineering and design work [Member] | Lower Passaic River Study Area | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  | $ 165,000,000 |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Defendants | Defendants |  |  |  |  |  |  |  |  | 120 |  |  |
Loss Contingency, Pending Claims, Number |  |  |  |  |  |  |  |  | 2 |  |  |
Design [Member] | Lower Passaic River Study Area | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated Remedy Implementation Period |  | 4 years |  |  |  |  |  |  |  |  |  |
Clean Up Implementation [Member] | Lower Passaic River Study Area | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated Remedy Implementation Period |  | 6 years |  |  |  |  |  |  |  |  |  |
EPA preferred alternative estimate [Member] | Lower Passaic River Study Area | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  |  |  |  |  |  | $ 1,700,000,000 |  |  |

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