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BRW Term Loan (Details) - USD ($)
shares in Millions, $ in Millions
Sep. 30, 2019
Nov. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Carrying amount of loan receivable $ 494  
BRW    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan amount   $ 456
Number of shares pledged as collateral (in shares)   516.0
Implied value equivalent of shares pledged as collateral (in ADRs)   64.5