Contingencies and Commitments - Loss Contingencies (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Environmental [Member]
Environmental Contingencies
Liability recorded for projected environmental remediation costs	$ 12	$ 19
Litigation Contingencies
Minimum potential loss	1
Maximum potential loss	6
Litigation [Member]
Litigation Contingencies
Minimum potential loss	1,100
Maximum potential loss	1,400
Aggregate reserves for claims deemed both probable and reasonably estimable	$ 258	$ 239

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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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