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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 |

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