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Investments (Internal Credit Quality Indicators) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 7,459 | $ 6,653
High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4,212 | 4,257
Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,928 | 2,180
Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 296 | 180
Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 16 | 0
Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 7 | 36
Year Of Origination 2020 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,303 | 1,284
Year Of Origination 2020 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 635 | 698
Year Of Origination 2020 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 668 | 586
Year Of Origination 2020 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2020 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2020 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2019 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 957 | 974
Year Of Origination 2019 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 573 | 684
Year Of Origination 2019 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 384 | 284
Year Of Origination 2019 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 6
Year Of Origination 2019 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2019 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2018 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 567 | 575
Year Of Origination 2018 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 304 | 327
Year Of Origination 2018 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 245 | 248
Year Of Origination 2018 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 18 | 0
Year Of Origination 2018 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2018 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2017 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 867 | 879
Year Of Origination 2017 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 491 | 561
Year Of Origination 2017 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 313 | 279
Year Of Origination 2017 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 63 | 39
Year Of Origination 2017 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2017 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2016 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 726
Year Of Origination 2016 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 422
Year Of Origination 2016 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 252
Year Of Origination 2016 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 52
Year Of Origination 2016 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 0
Year Of Origination 2016 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 0
Year Of Origination Prior Periods |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,524 | 2,215
Year Of Origination Prior Periods | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,734 | 1,565
Year Of Origination Prior Periods | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 564 | 531
Year Of Origination Prior Periods | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 203 | 83
Year Of Origination Prior Periods | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 16 | 0
Year Of Origination Prior Periods | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 7 | $ 36
Year of Origination 2021 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,241 |
Year of Origination 2021 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 475 |
Year of Origination 2021 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 754 |
Year of Origination 2021 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 12 |
Year of Origination 2021 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year of Origination 2021 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 0 |

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