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Investment Information - Allowance for expected credit losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period |  | $ 41 |
Balance at end of period |  | 28 | $ 41
Fixed maturities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period |  | 41 | 3
Additions for current-period provision for expected credit losses |  | 7 | 55
Additions (reductions) for previously recognized expected credit losses |  | (10) | (13)
Reductions due to disposals |  | (10) | (4)
Balance at end of period |  | 28 | 41
Structured securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | [1] | 9 | 1
Additions for current-period provision for expected credit losses | [1] | 2 | 14
Additions (reductions) for previously recognized expected credit losses | [1] | (3) | (4)
Reductions due to disposals | [1] | (1) | (2)
Balance at end of period | [1] | 7 | 9
Non-US government securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period |  | 2 | 0
Additions for current-period provision for expected credit losses |  | 0 | 2
Additions (reductions) for previously recognized expected credit losses |  | 0 | 0
Reductions due to disposals |  | (1) | 0
Balance at end of period |  | 1 | 2
Corporate bonds |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period |  | 30 | 2
Additions for current-period provision for expected credit losses |  | 5 | 39
Additions (reductions) for previously recognized expected credit losses |  | (7) | (9)
Reductions due to disposals |  | (8) | (2)
Balance at end of period |  | $ 20 | $ 30
[1] | Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.

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- 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of decrease in 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) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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