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Commitments and Contingencies Level 4 (Details) - Non-Environmental Liabilities (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 22	$ 22
Estimated Litigation Liability, Current	8	8
Brazil Tax Claim [Member]
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 35

Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

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