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Post-Employment Benefits (Weighted Average Asset Allocation) (Details)
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||||
| Weighted average asset allocation (as a percent) | 100.00% | 100.00% | 100.00% | |||||||
| Fixed Income [Member] | ||||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||||
| Weighted average asset allocation (as a percent) | 70.00% | [1] | 70.10% | [1] | 72.20% | [1] | ||||
| Cash and Short Term Assets [Member] | ||||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||||
| Weighted average asset allocation (as a percent) | 30.00% | [2] | 29.90% | [2] | 27.80% | [2] | ||||
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