Commitments and Contingencies (Schedule of Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Property, plant and equipment, net	$ 3,425	$ 3,350
Trade payables	799	649
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Property, plant and equipment, net	111	118
Trade payables	49	41
Current installments of long-term debt	8	7
Long-term debt	136	140
Total	193	188
Maximum exposure to loss	$ 311	$ 273