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Contingencies and Commitments - Loss Contingencies (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Environmental [Member]
Litigation Contingencies
Loss Contingency Range Of Possible Loss Maximum	$ 22
Environmental Contingencies
Liability recorded for projected environmental remediation costs	12
Litigation [Member]
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable	320	321
Loss Contingency Range Of Possible Loss Minimum	883
Loss Contingency Range Of Possible Loss Maximum	$ 1,600

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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- Definition

The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

+ References

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- Definition

The estimated maximum amount of possible loss from the contingency.

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