XML 131 R116.htm IDEA: XBRL DOCUMENT v3.25.4
Employee Benefit Arrangements - Fair Value of Plan Assets (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
fund_asset
Dec. 31, 2023
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value $ 1,819,000,000 $ 1,773,000,000  
Redemption of investor's units, period of required notice 60 days    
Cash and Cash Equivalents [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, net asset value $ 0 0  
U.S. Government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, net asset value 0 0  
U.S. corporate, state and municipalities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, net asset value 0 0  
Foreign securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, net asset value 0 0  
Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 180,000,000 120,000,000  
Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 1,371,000,000 1,384,000,000  
Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 78,000,000 92,000,000  
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 1,819,000,000 1,773,000,000 $ 1,831,000,000
Net, total pension assets, net asset value 190,000,000 177,000,000  
Projected benefit obligation 1,989,000,000 1,912,000,000 $ 1,999,000,000
Accrued benefit cost (334,000,000) (331,000,000)  
Prepaid benefit cost 164,000,000 192,000,000  
Pension Plan | Debt securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 1,545,000,000 1,521,000,000  
Net, total pension assets, net asset value 15,000,000 19,000,000  
Pension Plan | Cash and Cash Equivalents [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 31,000,000 18,000,000  
Pension Plan | Hedge Funds, Equity      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 15,000,000 19,000,000  
Net, total pension assets, net asset value 15,000,000 19,000,000  
Pension Plan | U.S. Government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 125,000,000 82,000,000  
Pension Plan | U.S. corporate, state and municipalities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 1,135,000,000 1,184,000,000  
Pension Plan | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 168,000,000 152,000,000  
Net, total pension assets, net asset value 69,000,000 $ 58,000,000  
Pension Plan | International Commingled Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Number of assets In fund | fund_asset   2  
Pension Plan | International Commingled Funds | Baillie Gifford Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 31,000,000 $ 26,000,000  
Unfunded commitments 0    
Pension Plan | International Commingled Funds | Silchester      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value $ 34,000,000 26,000,000  
Number of business days prior to month-end clients must submit redemption request 6 days    
Unfunded commitments $ 0    
Pension Plan | Other investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 106,000,000 100,000,000  
Net, total pension assets, net asset value 106,000,000 100,000,000  
Pension Plan | Real estate | UBS Trumbull Property Fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value $ 51,000,000 52,000,000  
Real return performance objective, rate of return 5.00%    
Pension Plan | Real estate | UBS Trumbull Property Fund | Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Real return performance objective, rate of return, determination period 3 years    
Pension Plan | Real estate | UBS Trumbull Property Fund | Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Real return performance objective, rate of return, determination period 5 years    
Pension Plan | Limited partnerships | Magnitude Institutional, Ltd.      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value $ 55,000,000 48,000,000  
Pension Plan | Foreign securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 239,000,000 218,000,000  
Pension Plan | Level 1 | Debt securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 161,000,000 103,000,000  
Pension Plan | Level 1 | Cash and Cash Equivalents [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 26,000,000 11,000,000  
Pension Plan | Level 1 | Hedge Funds, Equity      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 1 | U.S. Government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 125,000,000 82,000,000  
Pension Plan | Level 1 | U.S. corporate, state and municipalities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 10,000,000 10,000,000  
Pension Plan | Level 1 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 19,000,000 17,000,000  
Pension Plan | Level 1 | Other investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 1 | Foreign securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 2 | Debt securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 1,291,000,000 1,307,000,000  
Pension Plan | Level 2 | Cash and Cash Equivalents [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 5,000,000 7,000,000  
Pension Plan | Level 2 | Hedge Funds, Equity      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 2 | U.S. Government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 2 | U.S. corporate, state and municipalities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 1,068,000,000 1,102,000,000  
Pension Plan | Level 2 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 80,000,000 77,000,000  
Pension Plan | Level 2 | Other investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 2 | Foreign securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 218,000,000 198,000,000  
Pension Plan | Level 3 | Debt securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 78,000,000 92,000,000  
Pension Plan | Level 3 | Cash and Cash Equivalents [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 3 | Hedge Funds, Equity      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 3 | U.S. Government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 3 | U.S. corporate, state and municipalities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 57,000,000 72,000,000  
Pension Plan | Level 3 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 3 | Other investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Pension Plan | Level 3 | Foreign securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 21,000,000 20,000,000  
Nonqualified pension plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net, total pension assets, fair value 0 0  
Projected benefit obligation 334,000,000 331,000,000  
Accumulated benefit obligation $ 331,000,000 $ 328,000,000