Contingencies (Loss Contingencies) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Environmental
Environmental Contingencies
Liability recorded for projected environmental remediation costs	$ 19
Maximum potential loss related to environmental matters	4
Litigation
Environmental Contingencies
Maximum potential loss related to environmental matters	1,400
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable	239	320
Minimum potential loss related to environmental matters	$ 887

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

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Amount of loss contingency liability.

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The estimated maximum amount of possible loss from the contingency.

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