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Investments (Internal Credit Quality Indicators) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 6,329 | $ 5,861
High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4,111 | 3,438
Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,069 | 2,271
Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 109 | 111
Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4 | 4
Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 36 | 37
Year Of Origination 2020 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 674 | 763
Year Of Origination 2020 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 402 | 411
Year Of Origination 2020 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 272 | 352
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 | 1,003 | 1,112
Year Of Origination 2019 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 645 | 616
Year Of Origination 2019 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 331 | 496
Year Of Origination 2019 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 27 | 0
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 | 801 | 892
Year Of Origination 2018 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 461 | 493
Year Of Origination 2018 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 301 | 399
Year Of Origination 2018 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 39 | 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 | 645 | 762
Year Of Origination 2017 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 344 | 336
Year Of Origination 2017 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 296 | 407
Year Of Origination 2017 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 5 | 19
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 |  | 860
Year Of Origination 2016 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 574
Year Of Origination 2016 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 249
Year Of Origination 2016 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate |  | 37
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 | 2,108 | 1,472
Year Of Origination Prior Periods | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,534 | 1,008
Year Of Origination Prior Periods | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 502 | 368
Year Of Origination Prior Periods | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 32 | 55
Year Of Origination Prior Periods | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4 | 4
Year Of Origination Prior Periods | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 36 | $ 37
Year of Origination 2021 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,098 |
Year of Origination 2021 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 725 |
Year of Origination 2021 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 367 |
Year of Origination 2021 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 6 |
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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