v3.26.1
Investments (Internal Credit Rating Disclosure) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 12,097 $ 11,268
Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 11,494 10,821
Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 603 447
High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4,036 4,251
Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 6,933 6,024
Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 353 421
Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 172 125
Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 592 447
Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 11 0
Year Of Origination 2026 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 131  
Year Of Origination 2026 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 131  
Year Of Origination 2026 | Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0  
Year Of Origination 2025    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,245 2,544
Year Of Origination 2025 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 349 310
Year Of Origination 2025 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 90 636
Year Of Origination 2025 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,155 1,908
Year Of Origination 2025 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2025 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2025 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 339 310
Year Of Origination 2025 | Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 10 0
Year Of Origination 2024    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 2,521 1,844
Year Of Origination 2024 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 40 47
Year Of Origination 2024 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 623 587
Year Of Origination 2024 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,898 1,257
Year Of Origination 2024 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2024 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2024 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 39 47
Year Of Origination 2024 | Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1 0
Year Of Origination 2023    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,829 1,223
Year Of Origination 2023 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 8 9
Year Of Origination 2023 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 584 352
Year Of Origination 2023 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,245 788
Year Of Origination 2023 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 83
Year Of Origination 2023 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2023 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 8 9
Year Of Origination 2023 | Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2022    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,142 1,263
Year Of Origination 2022 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 18 21
Year Of Origination 2022 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 349 539
Year Of Origination 2022 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 713 617
Year Of Origination 2022 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 80 107
Year Of Origination 2022 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2022 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 18 21
Year Of Origination 2022 | Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2021    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,226 975
Year Of Origination 2021 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   54
Year Of Origination 2021 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 527 458
Year Of Origination 2021 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 593 481
Year Of Origination 2021 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 102 36
Year Of Origination 2021 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4 0
Year Of Origination 2021 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   54
Year Of Origination 2021 | Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   0
Year Of Origination Prior Periods [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 3,531 2,972
Year Of Origination Prior Periods [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 57 6
Year Of Origination Prior Periods [Member] | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,863 1,679
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,329 973
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 171 195
Year Of Origination Prior Periods [Member] | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 168 125
Year Of Origination Prior Periods [Member] | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 57 6
Year Of Origination Prior Periods [Member] | Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 0 $ 0