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Policyholders' account balances (Guaranteed Minimum Crediting Rates) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance $ 8,539 $ 8,016 $ 8,136
Universal Life      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 1,883   1,869
Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 984   726
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 317   371
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 405   680
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 177   92
Annuities [Member]      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 2,762   2,608
Annuities [Member] | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 1,011   916
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 1,675   1,645
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 76   47
Insurance, Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 2,556   2,391
Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 1,911   1,666
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 58   52
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 153   214
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 434   459
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 708   603
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 480   464
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 51   47
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 177   92
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 1,869   1,764
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 118   72
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 1,675   1,645
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 76   47
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 987   1,024
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 394   349
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 6   2
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 153   214
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 434   459
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 1,160   1,253
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 489   249
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 317   371
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 354   633
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   0
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 893   844
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 893   844
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 1,569   1,367
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 1,517   1,317
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 52   50
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   0
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 15   13
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 15   13
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   0
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   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 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 | Universal Life      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate 2.01%   2.01%
Minimum | 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, Guaranteed Minimum Crediting Rate 2.01%   2.01%
Minimum | 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, Guaranteed Minimum Crediting Rate 2.01%   2.01%
Minimum | 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, Guaranteed Minimum Crediting Rate 4.00%   4.00%
Minimum | 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, Guaranteed Minimum Crediting Rate 4.00%   4.00%
Minimum | 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, Guaranteed Minimum Crediting Rate 4.00%   4.00%
Maximum | 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, Guaranteed Minimum Crediting Rate 2.00%   2.00%
Maximum | 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, Guaranteed Minimum Crediting Rate 2.00%   2.00%
Maximum | 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, Guaranteed Minimum Crediting Rate 2.00%   2.00%
Maximum | 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, Guaranteed Minimum Crediting Rate 4.00%   4.00%
Maximum | 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, Guaranteed Minimum Crediting Rate 4.00%   4.00%
Maximum | 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, Guaranteed Minimum Crediting Rate 4.00%   4.00%