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Asbestos-Related Liabilities (Narrative) (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) Pending_Claim Claim | Dec. 31, 2016 Claim | Dec. 31, 2015 Claim | Dec. 31, 2014 Claim
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Holding period for insulation operations (in days) | 90 days |  |  |
Number of inactive claims | Claim | 19,000 | 19,000 |  |
Percentage of claims that do not specify damages | 81.00% |  |  |
Claims outstanding | Claim | 55,500 | 55,500 | 54,500 | 54,000
Accrued asbestos claims and related legal costs | $ 315 |  |  |
Unasserted claims | $ 272 |  |  |
Damage claims less than $5 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Percentage of claims damages specified | 15.00% |  |  |
Damage claims less than $5 | Maximum |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Damages claims amount | $ 5 |  |  |
Damage claims from $5 to less than $100 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Percentage of claims damages specified | 3.00% |  |  |
Damage claims from $5 to less than $100 | Maximum |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Damages claims amount | $ 100 |  |  |
Damage claims from $5 to less than $100 | Minimum |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Damages claims amount | $ 5 |  |  |
Damage claims less than $25 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Percentage of claims damages specified | 35.00% |  |  |
Damage claims less than $25 | Maximum |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Damages claims amount | $ 25 |  |  |
Damages claims in excess of $100 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Damages claims amount | $ 100 |  |  |
Claims outstanding | Pending_Claim | 6 |  |  |

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