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Other Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended		14 Months Ended
	Mar. 31, 2019	May 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Self insurance reserve, noncurrent			$ 42	$ 48
Accounts Payable and Accrued Liabilities
Loss Contingencies [Line Items]
Self insurance reserve, noncurrent			14	16
Other Current Liabilities
Loss Contingencies [Line Items]
Self insurance reserve, noncurrent			2	3
Other Liabilities
Loss Contingencies [Line Items]
Self insurance reserve, noncurrent			26	$ 29
Chadian Employee Class Action
Loss Contingencies [Line Items]
Damages awarded, value	$ 34	$ 25
Claims in unpaid bonuses		$ 122
Chadian Employee Class Action | Provisional Award
Loss Contingencies [Line Items]
Damages awarded, value	$ 2
North West Rail Link Project
Loss Contingencies [Line Items]
Claims in unpaid bonuses			$ 300
Noncontrolling interest, ownership percentage by parent			33.00%

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Amount of damages awarded to the plaintiff in the legal matter.

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