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Investments Investments (Internal Credit Rating Disclosure) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,063 | $ 5,727 |  |
Allowance for Loan and Lease Losses, Real Estate | 39 | $ 12 | $ 11 | $ 11
High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,783 |  |  |
Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,102 |  |  |
Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 157 |  |  |
Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4 |  |  |
Internal Noninvestment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 17 |  |  |
Year Of Origination 2020 [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 538 |  |  |
Year Of Origination 2020 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 302 |  |  |
Year Of Origination 2020 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 236 |  |  |
Year Of Origination 2020 [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 |  |  |
Year Of Origination 2020 [Member] | Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 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 |  |  |
Year Of Origination 2019 [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,191 |  |  |
Year Of Origination 2019 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 675 |  |  |
Year Of Origination 2019 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 516 |  |  |
Year Of Origination 2019 [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 |  |  |
Year Of Origination 2019 [Member] | Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 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 |  |  |
Year Of Origination 2018 [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 950 |  |  |
Year Of Origination 2018 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 623 |  |  |
Year Of Origination 2018 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 317 |  |  |
Year Of Origination 2018 [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 10 |  |  |
Year Of Origination 2018 [Member] | Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 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 |  |  |
Year Of Origination 2017 [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 770 |  |  |
Year Of Origination 2017 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 403 |  |  |
Year Of Origination 2017 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 342 |  |  |
Year Of Origination 2017 [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 25 |  |  |
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 2016 [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 899 |  |  |
Year Of Origination 2016 [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 603 |  |  |
Year Of Origination 2016 [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 269 |  |  |
Year Of Origination 2016 [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 27 |  |  |
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 | 1,715 |  |  |
Year Of Origination Prior Periods [Member] | High Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,177 |  |  |
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 422 |  |  |
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 95 |  |  |
Year Of Origination Prior Periods [Member] | Watch List [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 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 | $ 17 |  |  |

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21338-158488 + Details
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- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 + Details
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