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Investments Investments (Rollforward of Allowance For Credit Losses) (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Available-for-sale Securities [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 16 | $ 33 | $ 20 | $ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment | 7 | 42 |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | (10) | (9) |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | (1) |  |  |
Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | 11 | 32 | 17 | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment | 2 | 40 |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | (8) | (8) |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 0 |  |  |
Debt Security, Government, Non-US [Member] | Available-for-sale Securities [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | 4 | 1 | 0 | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment | 4 | 2 |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | 0 | (1) |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 0 |  |  |
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | 1 | 0 | 3 | $ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment | 1 | 0 |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | (2) | $ 0 |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | (1) |  |  |
Fixed maturity securities |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 16 |  | 20 |
Fixed maturity securities | Corporate Debt Securities [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 11 |  | 17 |
Fixed maturity securities | Debt Security, Government, Non-US [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 4 |  | 0 |
Fixed maturity securities | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 1 |  | $ 3 |

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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- Definition This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL6284393-111563 + Details
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- Definition The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL6284393-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL6284393-111563 + Details
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