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Other Commitments and Contingencies (Details) $ in Millions, $ in Millions			1 Months Ended		31 Months Ended
	Oct. 09, 2020 USD ($)	May 28, 2020 AUD ($)	Mar. 31, 2019 USD ($)	May 31, 2018 USD ($) lawsuit	Jun. 30, 2021 AUD ($)
Chadian Employee Class Action
Loss Contingencies [Line Items]
Number of class action cases | lawsuit				2
Damages awarded, value	$ 19		$ 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		$ 301			$ 300
North West Rail Link Project | Unincorporated Joint Venture
Loss Contingencies [Line Items]
Ownership percentage					33.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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