Contingencies and Litigation (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Letters of Credit and Surety Bonds Outstanding, Amount	$ 79
Brazil Tax And Labor Contingencies [Member]
Loss Contingencies [Line Items]
Unreserved tax and labor contingencies	670	$ 577
Escrow cash deposits	78
Net book value of assets with liens	15
Letters of Credit Outstanding, Amount	$ 127