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Investments (Internal Credit Quality Indicators) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 5,861 | $ 5,727
High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 3,438 |
Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,271 |
Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 111 |
Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4 |
Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 37 |
Year Of Origination 2020 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 763 |
Year Of Origination 2020 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 411 |
Year Of Origination 2020 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 352 |
Year Of Origination 2020 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2020 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2020 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2019 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,112 |
Year Of Origination 2019 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 616 |
Year Of Origination 2019 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 496 |
Year Of Origination 2019 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2019 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2019 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2018 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 892 |
Year Of Origination 2018 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 493 |
Year Of Origination 2018 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 399 |
Year Of Origination 2018 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2018 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2018 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2017 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 762 |
Year Of Origination 2017 | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 336 |
Year Of Origination 2017 | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 407 |
Year Of Origination 2017 | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 19 |
Year Of Origination 2017 | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 |
Year Of Origination 2017 | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 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 | 1,472 |
Year Of Origination Prior Periods | High Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,008 |
Year Of Origination Prior Periods | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 368 |
Year Of Origination Prior Periods | Average Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 55 |
Year Of Origination Prior Periods | Watch List |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4 |
Year Of Origination Prior Periods | Internal Noninvestment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 37 |

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