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Litigation, Environmental and Other Contingencies Other Commercial Matters (Details) $ in Millions |  | 1 Months Ended |
--- | --- | --- | ---
May 24, 2016 USD ($) | Nov. 30, 2017 USD ($) | Apr. 30, 2017 USD ($) | Dec. 31, 2018
Brinckerhoff Merger [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 9,200 |
Brinckerhoff Merger [Member] | Dismissed [Member] | Attorneys' fee [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Damages Sought, Value |  | $ 44 |  |
Price Reporting Litigation [Member] | Pending Litigation [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Pending Claims, Number |  |  |  | 2
KANSAS | Price Reporting Litigation [Member] | Dismissed [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Damages Sought, Value | $ 500 |  |  |
WISCONSIN | Price Reporting Litigation [Member] | Pending Litigation [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Damages Sought, Value | $ 300 |  |  |

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