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Investments (Internal Credit Rating Disclosure) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 9,441 | $ 8,952
Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9,359 | 8,952
High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 4,246
High Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,161 |
Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 4,299
Internal Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,796 |
Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 276
Average Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 261 |
Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 125
Watch List [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 135 |
Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 6
Internal Noninvestment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6 |
Year Of Origination 2022 | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 546 |
Year Of Origination 2022 | High Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 28 |
Year Of Origination 2022 | Internal Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 518 |
Year Of Origination 2022 | Average Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2022 | Watch List [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2022 | Internal Noninvestment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2021 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,863
Year Of Origination 2021 | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,861 |
Year Of Origination 2021 | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 593
Year Of Origination 2021 | High Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 592 |
Year Of Origination 2021 | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,270
Year Of Origination 2021 | Internal Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,269 |
Year Of Origination 2021 | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2021 | Average Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2021 | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2021 | Watch List [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2021 | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2021 | Internal Noninvestment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2020 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,205
Year Of Origination 2020 [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,200 |
Year Of Origination 2020 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 436
Year Of Origination 2020 [Member] | High Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 435 |
Year Of Origination 2020 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 750
Year Of Origination 2020 [Member] | Internal Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 746 |
Year Of Origination 2020 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 19
Year Of Origination 2020 [Member] | Average Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 19 |
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 2020 [Member] | Watch List [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
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] | Internal Noninvestment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2019 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,349
Year Of Origination 2019 [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,332 |
Year Of Origination 2019 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 543
Year Of Origination 2019 [Member] | High Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 539 |
Year Of Origination 2019 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 806
Year Of Origination 2019 [Member] | Internal Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 793 |
Year Of Origination 2019 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2019 [Member] | Average Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2019 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2019 [Member] | Watch List [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2019 [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2019 [Member] | Internal Noninvestment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2018 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,040
Year Of Origination 2018 [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,039 |
Year Of Origination 2018 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 600
Year Of Origination 2018 [Member] | High Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 600 |
Year Of Origination 2018 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 404
Year Of Origination 2018 [Member] | Internal Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 403 |
Year Of Origination 2018 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 36
Year Of Origination 2018 [Member] | Average Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 36 |
Year Of Origination 2018 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2018 [Member] | Watch List [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2018 [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2018 [Member] | Internal Noninvestment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2017 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 483
Year Of Origination 2017 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 246
Year Of Origination 2017 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 219
Year Of Origination 2017 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 18
Year Of Origination 2017 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 0
Year Of Origination 2017 [Member] | Internal Noninvestment Grade [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 |  | 3,012
Year Of Origination Prior Periods [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,381 |
Year Of Origination Prior Periods [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,828
Year Of Origination Prior Periods [Member] | High Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,967 |
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 850
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,067 |
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 203
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 206 |
Year Of Origination Prior Periods [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 125
Year Of Origination Prior Periods [Member] | Watch List [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 135 |
Year Of Origination Prior Periods [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 6
Year Of Origination Prior Periods [Member] | Internal Noninvestment Grade [Member] | Commercial Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 6 |

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