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Investments (Internal Credit Rating Disclosure) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 10,652 | $ 8,952
Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,408 | 8,952
High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,292 | 4,246
Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,648 | 4,299
Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 311 | 276
Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 26 | 6
Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 131 | 125
Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 244 | 0
Year Of Origination 2025 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,862 |
Year Of Origination 2025 | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 454 |
Year Of Origination 2025 | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,408 |
Year Of Origination 2025 | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2025 | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2025 | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2025 | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 151 | 0
Year Of Origination 2024 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,854 | 1,863
Year Of Origination 2024 | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 590 | 593
Year Of Origination 2024 | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,264 | 1,270
Year Of Origination 2024 | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2024 | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2024 | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2024 | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 45 | 0
Year Of Origination 2023 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,275 | 1,205
Year Of Origination 2023 | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 422 | 436
Year Of Origination 2023 | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 811 | 750
Year Of Origination 2023 | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 42 | 19
Year Of Origination 2023 | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2023 | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2023 | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2022 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,326 | 1,349
Year Of Origination 2022 | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 537 | 543
Year Of Origination 2022 | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 752 | 806
Year Of Origination 2022 | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 37 | 0
Year Of Origination 2022 | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2022 | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2022 | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6 | 0
Year Of Origination 2021 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 970 | 1,040
Year Of Origination 2021 | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 504 | 600
Year Of Origination 2021 | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 430 | 404
Year Of Origination 2021 | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 36 | 36
Year Of Origination 2021 | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2021 | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2021 | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 37 | 0
Year Of Origination 2020 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 483
Year Of Origination 2020 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 246
Year Of Origination 2020 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 219
Year Of Origination 2020 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 18
Year Of Origination 2020 [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2020 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination Prior Periods [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,121 | 3,012
Year Of Origination Prior Periods [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,785 | 1,828
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 983 | 850
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 196 | 203
Year Of Origination Prior Periods [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 26 | 6
Year Of Origination Prior Periods [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 131 | 125
Year Of Origination Prior Periods [Member] | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 5 | $ 0

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