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Investments (Internal Credit Rating Disclosure) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,058 | $ 5,861 |  |
Allowance for Loan and Lease Losses, Real Estate | 47 | 64 | $ 39 | $ 12
High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,476 | 3,438 |  |
Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,396 | 2,271 |  |
Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 146 | 111 |  |
Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4 | 4 |  |
Internal Noninvestment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 36 | 37 |  |
Year Of Origination 2021 |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 346 |  |  |
Year Of Origination 2021 | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 230 |  |  |
Year Of Origination 2021 | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 116 |  |  |
Year Of Origination 2021 | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 |  |  |
Year Of Origination 2021 | Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 |  |  |
Year Of Origination 2021 | Internal Noninvestment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 |  |  |
Year Of Origination 2020 [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 771 | 763 |  |
Year Of Origination 2020 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 411 | 411 |  |
Year Of Origination 2020 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 360 | 352 |  |
Year Of Origination 2020 [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0 |  |
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 | 1,073 | 1,112 |  |
Year Of Origination 2019 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 575 | 616 |  |
Year Of Origination 2019 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 498 | 496 |  |
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 | 878 | 892 |  |
Year Of Origination 2018 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 451 | 493 |  |
Year Of Origination 2018 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 388 | 399 |  |
Year Of Origination 2018 [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 39 | 0 |  |
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 | 731 | 762 |  |
Year Of Origination 2017 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 315 | 336 |  |
Year Of Origination 2017 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 397 | 407 |  |
Year Of Origination 2017 [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 19 | 19 |  |
Year Of Origination 2017 [Member] | Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 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 | 0 |  |
Year Of Origination 2016 [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 860 |  |
Year Of Origination 2016 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 574 |  |
Year Of Origination 2016 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 249 |  |
Year Of Origination 2016 [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 37 |  |
Year Of Origination 2016 [Member] | Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 0 |  |
Year Of Origination 2016 [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 | 2,259 | 1,472 |  |
Year Of Origination Prior Periods [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,494 | 1,008 |  |
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 637 | 368 |  |
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 88 | 55 |  |
Year Of Origination Prior Periods [Member] | Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4 | 4 |  |
Year Of Origination Prior Periods [Member] | Internal Noninvestment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 36 | $ 37 |  |

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