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Contingencies and Litigation - Brazilian Tax Contingencies (Details) - Brazil Contingencies - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Tax contingency - unreserved $ 425 $ 500
Escrow cash deposits 53 58
Surety bonds 98 106
Letters of credit 87 104
Liens on Brazilian assets $ 0 $ 0