Contingencies (Loss Contingencies) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Environmental
Environmental Contingencies
Liability recorded for projected environmental remediation costs	$ 12,000,000	$ 19,000,000
Maximum potential loss related to environmental matters	1,000,000
Litigation
Environmental Contingencies
Maximum potential loss related to environmental matters	1,200,000,000
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable	199,000,000	239,000,000
Minimum potential loss related to environmental matters	$ 1,100,000,000

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

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