| Liability and Receivable Balances | |||||||||
| At December 31 | |||||||||
| (Millions) | 2013 | 2012 | 2011 | ||||||
| Respirator mask/asbestos liabilities | $ | 152 | $ | 154 | $ | 130 | |||
| Respirator mask/asbestos insurance receivables | 58 | 87 | 121 | ||||||
| Environmental remediation liabilities | $ | 27 | $ | 29 | $ | 28 | |||
| Environmental remediation insurance receivables | 11 | 11 | 15 | ||||||
| Other environmental liabilities | $ | 48 | $ | 57 | $ | 75 | |||
| Other environmental insurance receivables | 15 | 15 | ― | ||||||