Long-term Financing Receivables (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable Recorded Investment [Line Items]
Financing Receivable	$ 239	$ 295
Brazil [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable	8	14
Dominican Republic [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable	35	49
Argentina [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable	196	232
Financing Receivables Period Of Collection	10 years
Argentina [Member] | Noncurrent Receivables Excluded From Total [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable	$ 120	$ 82