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Investments (Internal Credit Rating Disclosure) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,895 | $ 6,653
High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,246 | 4,257
Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,425 | 2,180
Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 205 | 180
Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 19 | 36
Year Of Origination 2022 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 311 |
Year Of Origination 2022 | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 66 |
Year Of Origination 2022 | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 245 |
Year Of Origination 2022 | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2022 | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 |
Year Of Origination 2022 | Internal Noninvestment Grade [Member] |  |
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 | 1,293 | 1,284
Year Of Origination 2021 | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 694 | 698
Year Of Origination 2021 | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 599 | 586
Year Of Origination 2021 | Average Investment 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 | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2020 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 965 | 974
Year Of Origination 2020 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 676 | 684
Year Of Origination 2020 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 283 | 284
Year Of Origination 2020 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6 | 6
Year Of Origination 2020 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 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 | 0
Year Of Origination 2019 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 573 | 575
Year Of Origination 2019 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 335 | 327
Year Of Origination 2019 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 238 | 248
Year Of Origination 2019 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination 2019 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 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 | 0
Year Of Origination 2018 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 876 | 879
Year Of Origination 2018 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 531 | 561
Year Of Origination 2018 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 306 | 279
Year Of Origination 2018 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 39 | 39
Year Of Origination 2018 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 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 | 0
Year Of Origination 2017 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 726
Year Of Origination 2017 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 422
Year Of Origination 2017 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 252
Year Of Origination 2017 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 52
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 | 2,877 | 2,215
Year Of Origination Prior Periods [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,944 | 1,565
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 754 | 531
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 160 | 83
Year Of Origination Prior Periods [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Year Of Origination Prior Periods [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 19 | $ 36

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