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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended			36 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Brazilian Federal Revenue Service [Member] item	Dec. 31, 2007 Brazilian Federal Revenue Service [Member]	Dec. 31, 2006 Brazilian Federal Revenue Service [Member]	Dec. 31, 2004 Brazilian Federal Revenue Service [Member]	Jun. 30, 2006 Argentine Tax Authorities [Member]
Income Taxes [Line Items]
Effective income tax rate	28.00%	28.70%
Number of separate tax assessments			3
Tax assessment received consisting of tax, penalty, and interest				$ 85	$ 20	$ 486	$ 60
Estimated further assessments that could be received			$ 104

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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