Schedule of Assets (Held at End of Year) - Schedule of Assets (Details) - EBP 002
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12 Months Ended |
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Dec. 31, 2025
USD ($)
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Plan Name |
EMPLOYEE SAVINGS AND STOCK OWNERSHIP PLAN OF GENERAL RE
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| Entity Tax Identification Number |
06-1026471
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| EBP, Plan Number |
002
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| Notes receivable from participants |
$ 3,925,283
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| Total assets held for investment purposes |
$ 1,700,094,061
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| Employee benefit plan, asset held for investment, participant loan, maturity year |
2054
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| Investment, Identifier [Axis]: Collective Trust Fidelity Management Trust Co. Growth Company Commingled Pool A |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 251,877,448
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Management Trust Co [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Collective Trust Fidelity Management Trust Co. Managed Income Portfolio - Class 2 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 11,867,327
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Management Trust Co [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds American Beacon Large-Cap Fund R6 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 18,540,273
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
American Beacon [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| Investment, Identifier [Axis]: Mutual Funds American Funds Capital World Growth & Income Fund R6 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 17,223,341
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
American Funds [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| Investment, Identifier [Axis]: Mutual Funds BlackRock BlackRock Strategic Global Bond Fund K |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 7,652,946
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
BlackRock [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Balanced Fund K |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 119,219,633
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Emerging Markets K |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 16,277,242
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index 2010 IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 153,815
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index 2015 IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 3,117,545
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index 2020 IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 10,317,147
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index 2025 IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 27,048,541
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index 2030 IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 25,015,807
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index 2035 IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 23,190,872
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index 2040 IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 29,216,288
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index 2050 IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 12,376,158
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index 2060 IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 642,775
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Freedom Index Income IPR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 1,417,119
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Government Institutional Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 77,789,302
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Overseas Fund K |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 17,167,641
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Real Estate Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 7,270,371
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity S&P 500 Index |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 136,340,984
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Spartan US Bond Index Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 32,983,363
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Mutual Funds Neuberger Berman Genesis Trust Fund R6 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 16,287,488
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Neuberger Berman [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| Investment, Identifier [Axis]: Mutual Funds PIMCO High Yield Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 15,968,545
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
PIMCO [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| Investment, Identifier [Axis]: Mutual Funds Vanguard All World Index Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 20,251,400
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| Investment, Identifier [Axis]: Mutual Funds Vanguard Inflation Protected Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 13,101,104
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| Investment, Identifier [Axis]: Mutual Funds Vanguard Mid-Cap Index Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 43,487,760
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| Investment, Identifier [Axis]: Mutual Funds Vanguard Small-Cap Index Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 32,132,339
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| Investment, Identifier [Axis]: Separately Managed Funds Berkshire B Unitized Stock Fund - Money Market |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Current Value |
$ 1,196,695
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanPooledSeparateAccountMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
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| Investment, Identifier [Axis]: Separately Managed Funds Berkshire Hathaway Berkshire B Unitized Stock Fund - Common Stock |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 91,803,493
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanPooledSeparateAccountMember
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Berkshire Hathaway [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Separately Managed Funds Berkshire Hathaway Gen Re Berkshire B ESOP Fund - Common Stock |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Current Value |
$ 615,234,016
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanPooledSeparateAccountMember
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Berkshire Hathaway [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
EBP, Participant-Directed [Member]
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Minimum |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Asset Held for Investment, Participant Loan, Interest Rate |
4.25%
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| Maximum |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Participant Loan, Interest Rate |
10.50%
|