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Investments (Internal Credit Rating Disclosure) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 6,613 | $ 6,329
High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4,170 | 4,111
Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,220 | 2,069
Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 187 | 109
Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 4
Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 36 | 36
Year Of Origination Prior Periods [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,292 | 2,108
Year Of Origination Prior Periods [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,538 | 1,534
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 629 | 502
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 89 | 32
Year Of Origination Prior Periods [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 4
Year Of Origination Prior Periods [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 36 | 36
Year Of Origination 2016 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 645
Year Of Origination 2016 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 344
Year Of Origination 2016 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 296
Year Of Origination 2016 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 5
Year Of Origination 2016 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 0
Year Of Origination 2016 [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 0
Year Of Origination 2017 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 762 | 801
Year Of Origination 2017 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 417 | 461
Year Of Origination 2017 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 279 | 301
Year Of Origination 2017 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 66 | 39
Year Of Origination 2017 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2017 [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2018 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 917 | 1,003
Year Of Origination 2018 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 568 | 645
Year Of Origination 2018 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 323 | 331
Year Of Origination 2018 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 26 | 27
Year Of Origination 2018 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2018 [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2019 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 576 | 674
Year Of Origination 2019 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 331 | 402
Year Of Origination 2019 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 245 | 272
Year Of Origination 2019 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2019 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2019 [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2020 [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 987 | 1,098
Year Of Origination 2020 [Member] | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 697 | 725
Year Of Origination 2020 [Member] | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 284 | 367
Year Of Origination 2020 [Member] | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 6 | 6
Year Of Origination 2020 [Member] | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 0
Year Of Origination 2020 [Member] | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | $ 0
Year Of Origination 2021 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,079 |
Year Of Origination 2021 | High Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 619 |
Year Of Origination 2021 | Internal Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 460 |
Year Of Origination 2021 | Average Investment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2021 | Watch List [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2021 | Internal Noninvestment Grade [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 0 |

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