Contingencies (Certain Other Actions Narrative) (Details) - Entity [Domain] $ in Millions	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items]
Contingent liability related to performance surety bonds	$ 32
Redeemable noncontrolling interest	$ 36	$ 35
Argentine Growers Case [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	6
Number of Cases Stayed	5
Letter of Credit [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	$ 64
Credit Agreement [Member] | Revolving Credit Facility [Member]
Loss Contingencies [Line Items]
Credit line available under the agreement	$ 3,000