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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 |

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