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Employee Benefit Plans (Asset Allocation Targets Reflecting a Percentage of Total Assets by Asset Class) (Details)	Dec. 31, 2023
Minimum | Pension Benefits | U.S. Equities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	0.00%
Minimum | Pension Benefits | International Equities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	0.00%
Minimum | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	53.00%
Minimum | Pension Benefits | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	0.00%
Minimum | Pension Benefits | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	3.00%
Minimum | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	8.00%
Minimum | Postretirement | U.S. Equities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	17.00%
Minimum | Postretirement | International Equities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	3.00%
Minimum | Postretirement | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	29.00%
Minimum | Postretirement | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	0.00%
Minimum | Postretirement | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	0.00%
Minimum | Postretirement | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	0.00%
Maximum | Pension Benefits | U.S. Equities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	3.00%
Maximum | Pension Benefits | International Equities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	10.00%
Maximum | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	71.00%
Maximum | Pension Benefits | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	11.00%
Maximum | Pension Benefits | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	18.00%
Maximum | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	38.00%
Maximum | Postretirement | U.S. Equities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	59.00%
Maximum | Postretirement | International Equities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	21.00%
Maximum | Postretirement | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	69.00%
Maximum | Postretirement | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	23.00%
Maximum | Postretirement | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	0.00%
Maximum | Postretirement | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Asset allocation targets	0.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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