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Commitments and Contingencies (Schedule Of Settlement And Defense Costs) (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) claim | Jun. 30, 2020 USD ($) claim | Jun. 30, 2021 USD ($) claim | Jun. 30, 2020 USD ($) claim | Dec. 31, 2020 USD ($) claim | Dec. 31, 2019 USD ($) claim | Dec. 31, 2018 USD ($) | Mar. 31, 2021 claim | Mar. 31, 2020 claim
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax cash payments |  |  | $ 20,200,000 | $ 19,200,000 |  |  |  |  |
Estimated Funds Available From Post Bankruptcy Trusts To Pay Current And Future Claimants | $ 36,000,000,000 |  | 36,000,000,000 |  |  |  |  |  |
Current asbestos liability | $ 66,500,000 |  | $ 66,500,000 |  | $ 66,500,000 |  |  |  |
Asbestos Commitments and Contingencies |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Estimated Percentage Of Insurance Which Covers Asbestos Costs |  |  |  |  |  | 14.00% |  |  |
Asbestos Cumulative Claims Resolved | claim | 142,000 |  | 142,000 |  |  |  |  |  |
Loss Contingency, Pending Claims, Number | claim | 29,788 | 28,927 | 29,788 | 28,927 | 29,138 | 29,056 |  | 29,407 | 29,162
Settlement / indemnity costs incurred (1) | $ 8,400,000 | $ 7,600,000 | $ 13,900,000 | $ 15,800,000 | $ 35,300,000 |  |  |  |
Defense costs incurred (1) | 3,800,000 | 3,600,000 | 7,400,000 | 8,100,000 | 15,600,000 |  |  |  |
Gross Settlement And Defense Incurred Costs | 12,200,000 | 11,200,000 | 21,300,000 | 23,900,000 | 50,900,000 |  |  |  |
Settlement / indemnity payments | 9,400,000 | 5,900,000 | 19,500,000 | 16,900,000 | 24,700,000 |  |  |  |
Defense payments | 4,200,000 | 4,200,000 | 7,400,000 | 8,500,000 | 16,700,000 |  |  |  |
Insurance receipts | (4,200,000) | (2,700,000) | (6,700,000) | (6,200,000) | (10,300,000) |  |  |  |
Pre-tax cash payments | 9,400,000 | $ 7,400,000 | 20,200,000 | $ 19,200,000 | 31,100,000 |  |  |  |
Cumulative Related Settlement Cost Incurred Before Insurance Recoveries | 692,000,000 |  | 692,000,000 |  |  |  |  |  |
Cumulative Asbestos Settlement Cost Per Resolved Claim | 4,900 |  | 4,900 |  |  |  |  |  |
Asbestos Settlement Cost Per Resolved Claim |  |  | 13,900 |  |  | $ 15,800 | $ 11,300 |  |
Increase In Total Asbestos Liability |  |  |  |  |  | 255,000,000 |  |  |
Insurance Receivable Asbestos | 80,000,000 |  | 80,000,000 |  | 87,000,000 | 98,000,000 |  |  |
Asbestos Liability | 643,000,000 |  | 643,000,000 |  | 670,000,000 | $ 712,000,000 |  |  |
Percentage Of Asbestos Liability Attributable To Settlement And Defense Costs For Future Claims |  |  |  |  |  | 85.00% |  |  |
Current asbestos liability | 66,500,000 |  | 66,500,000 |  | $ 66,500,000 |  |  |  |
Aggregate Value Of Policy Buy Out Agreements | $ 82,500,000 |  | $ 82,500,000 |  |  |  |  |  |

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