Schedule of Assets (Held at End of Year) - Schedule of Assets (Details) - EBP 005
|
12 Months Ended |
|
Dec. 31, 2025
USD ($)
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Plan Name |
JOHNS MANVILLE EMPLOYEES 401(k) PLAN
|
| Entity Tax Identification Number |
84-0856796
|
| EBP, Plan Number |
005
|
| Notes receivable from participants |
$ 28,066,596
|
| TOTAL |
$ 1,169,217,083
|
| Employee benefit plan, asset held for investment, participant loan, maturity year |
2050
|
| Investment, Identifier [Axis]: American Beacon Fund Small Cap Value R5 Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 6,721,539
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
American Beacon Fund Small Cap Value R5 [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: American Funds New World R6 Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 7,717,447
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
American Funds New World R6 [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Baillie Gifford International Alpha K Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 20,422,849
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Baillie Gifford International Alpha K [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Berkshire Fund, Money Market Fund |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 2,269,633
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Money Market Funds [Member]
|
| Investment, Identifier [Axis]: Berkshire Hathaway B Unitized Berkshire Fund, Berkshire Hathaway Inc., Class B Common Stock |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 55,038,164
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Berkshire Hathaway B Unitized [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanEmployerCommonStockMember
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| Investment, Identifier [Axis]: BlackRock Inflation Protected Institutional Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 3,841,376
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
BlackRock Inflation Protected Institutional [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Dodge & Cox Income Class X Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 15,580,960
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Dodge & Cox Income Class X [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Fidelity 500 Index Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 131,334,488
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity 500 Index [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Fidelity Low Priced Stock Fund K6 Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 17,986,919
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Low Priced Stock Fund K6 [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Fidelity Mid Cap Index Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 44,066,596
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Mid Cap Index [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Fidelity OTC Pool Class A Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 213,533,952
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity OTC Pool Class A [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: Fidelity Short-Term Bond Index Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 9,388,966
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Short-Term Bond Index [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Fidelity Small Cap Index Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 12,467,420
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Small Cap Index [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Fidelity Total International Index Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 10,517,219
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Total International Index [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Fidelity US Bond Index Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 11,593,864
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity US Bond Index [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Janus Henderson Triton N Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 17,905,541
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Janus Henderson Triton N [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: PIMCO High Yield Institutional Class Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 10,319,735
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
PIMCO High Yield Institutional Class [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2005 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 3,857,729
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2005 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2010 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 3,489,494
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2010 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2015 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 3,168,431
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2015 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2020 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 25,824,914
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2020 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2025 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 35,906,718
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2025 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2030 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 78,756,401
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2030 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2035 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 76,993,296
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2035 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2040 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 64,654,345
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2040 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2045 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 55,730,141
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2045 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2050 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 47,870,403
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2050 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2055 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 34,757,716
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2055 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2060 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 24,133,033
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2060 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: T. Rowe Price Retirement 2065 F Common/ Collective Trust |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 8,409,323
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price Retirement 2065 F [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
| Investment, Identifier [Axis]: Vanguard Federal Money Market VMMR Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 46,597,288
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Federal Money Market VMMR [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Investment, Identifier [Axis]: Vanguard Windsor II Fund Admiral Registered Investment Company |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 40,294,587
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Windsor II Fund Admiral [Member]
|
| EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| Minimum |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Employee benefit plan, asset held for investment, participant loan, interest rate |
4.25%
|
| Maximum |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Employee benefit plan, asset held for investment, participant loan, interest rate |
10.00%
|