v3.26.3
Investments (Internal Credit Rating Disclosure) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 12,344 $ 11,268
Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 11,736 10,821
Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 608 447
High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4,023 4,251
Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 7,240 6,024
Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 264 421
Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 197 125
Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 577 447
Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 12 0
Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 31 0
Year Of Origination 2026    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,821  
Year Of Origination 2026 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 168  
Year Of Origination 2026 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 274  
Year Of Origination 2026 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,547  
Year Of Origination 2026 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0  
Year Of Origination 2026 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0  
Year Of Origination 2026 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 168  
Year Of Origination 2026 | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0  
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 2,517 2,544
Year Of Origination 2025 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 326 310
Year Of Origination 2025 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 621 636
Year Of Origination 2025 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,896 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 296 310
Year Of Origination 2025 | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
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 30 0
Year Of Origination 2024    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,827 1,844
Year Of Origination 2024 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 33 47
Year Of Origination 2024 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 582 587
Year Of Origination 2024 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,245 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 32 47
Year Of Origination 2024 | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
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 1,117 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 330 352
Year Of Origination 2023 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 708 788
Year Of Origination 2023 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 54 83
Year Of Origination 2023 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 25 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]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
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 1,222 1,263
Year Of Origination 2022 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 17 21
Year Of Origination 2022 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 533 539
Year Of Origination 2022 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 611 617
Year Of Origination 2022 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 74 107
Year Of Origination 2022 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4 0
Year Of Origination 2022 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 17 21
Year Of Origination 2022 | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
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   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   458
Year Of Origination 2021 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   481
Year Of Origination 2021 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   36
Year Of Origination 2021 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   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]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   0
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 3,232 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 56 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 1,683 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 1,233 973
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 136 195
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 56 6
Year Of Origination Prior Periods [Member] | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 12 0
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