v3.26.1
Investments (Internal Credit Rating Disclosure) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 11,477 $ 11,268
Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 10,969 10,821
Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 508 447
High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   4,251
High Investment Grade [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4,068  
Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   6,024
Internal Investment Grade [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 6,372  
Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   421
Average Investment Grade [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 386  
Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   125
Watch List [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 143  
Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4 0
Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 504 447
Year Of Origination 2024 | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,839 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 585 587
Year Of Origination 2024 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,254 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 | 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 2024 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 40 47
Year Of Origination 2023 | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,189 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 351 352
Year Of Origination 2023 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 755 788
Year Of Origination 2023 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 71 83
Year Of Origination 2023 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 12 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 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 2026 | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 491  
Year Of Origination 2026 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 21  
Year Of Origination 2026 | High Investment Grade [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 26  
Year Of Origination 2026 | Internal Investment Grade [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 465  
Year Of Origination 2026 | Average Investment Grade [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0  
Year Of Origination 2026 | Watch List [Member] | Commercial Real Estate    
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 2026 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 21  
Year Of Origination 2022 | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,234 1,263
Year Of Origination 2022 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 20 21
Year Of Origination 2022 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 531 539
Year Of Origination 2022 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 596 617
Year Of Origination 2022 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 107 107
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 | 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 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 20 21
Year Of Origination 2021 | Commercial Real Estate    
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 | 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 2021 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   54
Year Of Origination 2025 | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 2,531 2,544
Year Of Origination 2025 | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 361 310
Year Of Origination 2025 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 625 636
Year Of Origination 2025 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,906 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 | Internal Noninvestment Grade [Member] | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4 0
Year Of Origination 2025 | Investment Performance | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 357 310
Year Of Origination Prior Periods [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 3,685 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 58 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   1,679
Year Of Origination Prior Periods [Member] | High Investment Grade [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,950  
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   973
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,396  
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   195
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 208  
Year Of Origination Prior Periods [Member] | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   125
Year Of Origination Prior Periods [Member] | Watch List [Member] | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 131  
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
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 $ 58 $ 6