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Investments - Investments - ACL on Fixed Maturities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning Balance | $ (1) | $ (23) | $ 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 20 | 2 | 39
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | (4) | (18) | (7)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery | (3) | 0 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 1 | (6) | (9)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff | 3 | 0 | 0
Ending Balance | (12) | (1) | (23)
CMBS |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning Balance | 0 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 7 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | 0 |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery | 0 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 3 |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff | 0 |  |
Ending Balance | (10) | 0 |
Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning Balance | (1) | (23) | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 10 | 2 | 36
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | (3) | (18) | (4)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery | 0 | 0 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | (3) | (6) | (9)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff | 3 | 0 | 0
Ending Balance | (2) | (1) | (23)
Municipal |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning Balance | 0 | 0 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded |  |  | 3
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold |  |  | (3)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery |  |  | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) |  |  | 0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff |  |  | 0
Ending Balance | 0 | 0 | $ 0
Debt Security, Government, Non-US [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning Balance | 0 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 3 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | (1) |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery | (3) |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 1 |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff | 0 |  |
Ending Balance | $ 0 | $ 0 |

X
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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