v3.26.3
Policyholders' account balances (Guaranteed Minimum Crediting Rates) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance $ 9,445 $ 8,576 $ 8,539
Universal Life      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 1,857   1,883
Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 411   504
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 174   317
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 194   405
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 583   168
Insurance, Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 3,163   2,556
Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 989   1,082
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   58
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 355   129
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 94   34
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 323   219
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 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 0001 to 0050      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 13   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 43   51
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 267   168
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 182   172
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 2   3
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   6
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 84   129
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 94   34
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 1,019   1,160
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 391   489
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 161   317
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 151   354
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 316   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 1,258   1,131
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 987   1,079
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 0   52
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 271   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 20   15
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 20   15
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 | 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
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Fixed Rate or No Guarantee | Universal Life      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance 495   489
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Fixed Rate or No Guarantee | Insurance, Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance $ 1,723   $ 1,253
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 | 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 | 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 | 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 | Insurance, Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate 4.00%   4.00%