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Contingencies and Litigation - Brazilian Tax Contingencies (Details) - Brazil Contingencies - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]    
Tax contingency - unreserved $ 336 $ 442
Escrow cash deposits 38 51
Surety bonds 102 135
Letters of credit 71 91
Liens on Brazilian assets $ 0 $ 0