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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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No definition available.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Number of pending claims pertaining to a loss contingency.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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