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Policyholders' account balances (Guaranteed Minimum Crediting Rates) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | $ 8,136 | $ 7,462 | $ 7,178
Universal Life |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 1,869 |  | 1,785
Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 726 |  | 522
Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 371 |  | 330
Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 680 |  | 589
Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 92 |  | 344
Annuities [Member] |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 2,608 |  | 2,340
Annuities [Member] | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 916 |  | 797
Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 1,645 |  | 1,543
Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 47 |  | 0
Insurance, Other |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 2,391 |  | 2,449
Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 1,666 |  | 1,116
Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 52 |  | 531
Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 214 |  | 257
Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 459 |  | 545
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 603 |  | 462
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 464 |  | 421
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 47 |  | 30
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 92 |  | 11
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member] |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 1,764 |  | 2,236
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member] | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 72 |  | 693
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 1,645 |  | 1,543
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 47 |  | 0
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 1,024 |  | 1,513
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 349 |  | 738
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 2 |  | 0
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 214 |  | 230
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 459 |  | 545
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 1,253 |  | 1,302
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 249 |  | 80
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 371 |  | 330
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 633 |  | 559
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 333
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member] |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 844 |  | 104
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member] | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 844 |  | 104
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 1,367 |  | 931
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 1,317 |  | 373
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 50 |  | 531
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 27
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 13 |  | 21
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 13 |  | 21
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member] |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member] | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 5
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 5
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | 0 |  | 0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance | $ 0 |  | $ 0
Minimum | Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate | 2.01% |  |
Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate | 4.00% |  |
Maximum | Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate | 2.00% |  |
Maximum | Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate | 4.00% |  |

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- Definition Guaranteed minimum crediting rate on policyholder account balance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
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- Definition Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(14)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
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