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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2025
Retirement Benefits [Abstract] |
Schedule of Change in Projected Benefit Obligation, Plan Assets and Funded Status |
Change in benefit obligation, plan assets and funded status
|  | As of December 31,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
($ in millions) |  | Pension benefits |  | Postretirement benefits
Change in benefit obligation |  |  |  |  |  |  |  |
Benefit obligation, beginning of year |  | $ | 4,441 |  |  | $ | 4,584 |  |  | $ | 163 |  |  | $ | 185 |
Service cost |  | 107 |  |  | 80 |  |  | — |  |  | — |
Interest cost |  | 235 |  |  | 230 |  |  | 8 |  |  | 9 |
Participant contributions |  | — |  |  | — |  |  | 11 |  |  | 13 |
Remeasurement of benefit obligation (gains) losses |  | 101 |  |  | (125) |  |  | (5) |  |  | (4) |
Benefits paid |  | (449) |  |  | (329) |  |  | (32) |  |  | (37) |
Translation adjustment and other |  | 5 |  |  | 1 |  |  | 2 |  |  | (3) |
Benefit obligation, end of year |  | $ | 4,440 |  |  | $ | 4,441 |  |  | $ | 147 |  |  | $ | 163 |
Change in plan assets |  |  |  |  |  |  |  |
Fair value of plan assets, beginning of year |  | $ | 4,368 |  |  | $ | 4,440 |  |  |  |  |
Actual return on plan assets |  | 445 |  |  | 214 |  |  |  |  |
Employer contribution |  | 44 |  |  | 45 |  |  |  |  |
Benefits paid |  | (449) |  |  | (329) |  |  |  |  |
Translation adjustment and other |  | 6 |  |  | (2) |  |  |  |  |
Fair value of plan assets, end of year |  | $ | 4,414 |  |  | $ | 4,368 |  |  |  |  |
Funded status (1) |  | $ | (26) |  |  | $ | (73) |  |  | $ | (147) |  |  | $ | (163) |
Amounts recognized in AOCI |  |  |  |  |  |  |  |
Unamortized pension and other postretirement prior service credit |  | $ | — |  |  | $ | — |  |  | $ | (14) |  |  | $ | (15) |
(1)The funded status is recorded within other liabilities and accrued expenses on the Consolidated Statements of Financial Position.
Schedule of Changes in Items Not Yet Recognized as a Component of Net Cost for Pension and Other Postretirement Plans |
Changes in items not yet recognized as a component of net cost for pension and other postretirement plans
($ in millions) |  | Pension benefits |  | Postretirement benefits
Items not yet recognized as a component of net cost – December 31, 2024 |  | $ | — |  |  | $ | (15) |
Prior service credit amortized to net cost |  | — |  |  | 1 |
Translation adjustment and other |  | — |  |  | — |
Items not yet recognized as a component of net cost – December 31, 2025 |  | $ | — |  |  | $ | (14) |
Schedule of Components of Net Cost (Benefit) for Pension and Other Postretirement Plans |
Components of net cost (benefit) for pension and other postretirement plans |
|  | For the years ended December 31, |
|  | 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023 |
($ in millions) |  | Pension benefits |  | Postretirement benefits |  | Total pension and postretirement benefits |
Service cost (1) |  | $ | 107 |  |  | $ | 80 |  |  | $ | 132 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 107 |  |  | $ | 80 |  |  | $ | 133 |  |
Interest cost |  | 235 |  |  | 230 |  |  | 239 |  |  | 8 |  |  | 9 |  |  | 10 |  |  | 243 |  |  | 239 |  |  | 249 |  |
Expected return on plan assets |  | (313) |  |  | (306) |  |  | (306) |  |  | — |  |  | — |  |  | — |  |  | (313) |  |  | (306) |  |  | (306) |  |
Amortization of prior service credit |  | — |  |  | — |  |  | — |  |  | (1) |  |  | (1) |  |  | (21) |  |  | (1) |  |  | (1) |  |  | (21) |  |
Costs and expenses |  | 29 |  |  | 4 |  |  | 65 |  |  | 7 |  |  | 8 |  |  | (10) |  |  | 36 |  |  | 12 |  |  | 55 |  |
Remeasurement of benefit obligation |  | 101 |  |  | (125) |  |  | 125 |  |  | (5) |  |  | (4) |  |  | (4) |  |  | 96 |  |  | (129) |  |  | 121 |  |
Remeasurement of plan assets |  | (131) |  |  | 92 |  |  | (112) |  |  | — |  |  | — |  |  | — |  |  | (131) |  |  | 92 |  |  | (112) |  |
Remeasurement (gains) losses |  | (30) |  |  | (33) |  |  | 13 |  |  | (5) |  |  | (4) |  |  | (4) |  |  | (35) |  |  | (37) |  |  | 9 |  |
Total net (benefit) cost |  | $ | (1) |  |  | $ | (29) |  |  | $ | 78 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | (14) |  |  | $ | 1 |  |  | $ | (25) |  |  | $ | 64 |  |
(1) For 2024, service cost includes a $38 million refund of premiums previously paid to the Pension Benefit Guaranty Corporation.
Schedule of Accumulated Benefit Obligation of Plan Assets | The following table provides information on pension plans where the projected and accumulated benefit obligation are in excess of plan assets.
Pension plans
|  | As of December 31,
($ in millions) |  | 2025 |  | 2024
PBO |  | $ | 72 |  |  | $ | 74 |
ABO |  | 71 |  |  | 72 |
Fair value of plan assets |  | — |  |  | — |
Schedule of Weighted Average Assumptions Used to Determine Net Pension Cost and Net Postretirement Benefit Cost and Benefit Obligations |
Weighted average assumptions used to determine net pension cost and net postretirement benefit cost
|  | For the years ended December 31,
|  | 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023
|  | Pension benefits |  | Postretirement benefits
Discount rate |  | 5.55 | % |  | 5.36 | % |  | 5.65 | % |  | 5.34 | % |  | 5.30 | % |  | 5.66 | %
Expected long-term rate of return on plan assets |  | 7.58 |  |  | 7.34 |  |  | 7.35 |  |  | n/a |  | n/a |  | n/a
Cash balance interest credit rate |  | 4.72 |  |  | 4.25 |  |  | 4.05 |  |  | n/a |  | n/a |  | n/a
Weighted average assumptions used to determine benefit obligations
|  | As of December 31,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | Pension benefits |  | Postretirement benefits
Discount rate |  | 5.52 | % |  | 5.71 | % |  | 5.31 | % |  | 5.50 | %
Cash balance interest credit rate |  | 4.84 |  |  | 4.78 |  |  | n/a |  | n/a
Schedule of Weighted Average Target Asset Allocation and Actual Percentage of Plan Assets by Asset Category |
Pension plan weighted average target asset allocation by asset category (1)
|  | As of December 31, 2025
Equity securities |  | 24% - 41% |  |  |  |
Fixed income securities |  | 50% - 69% |  |  |  |
Limited partnership interests |  | 1% - 29% |  |  |  |
Bank loans |  | 0% - 12% |  |  |  |
(1)The target asset allocation considers risk-based exposure including exposure provided through derivatives.
Schedule of Fair Values of Pension Plan Assets |
Fair values of pension plan assets as of December 31, 2025
($ in millions) |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |  | Balance as of December 31, 2025
Equity securities |  | $ | 128 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 133 |
Fixed income securities: |  |  |  |  |  |  |  |
Government bonds (1) |  | 1,296 |  |  | 128 |  |  | — |  |  | 1,424 |
Corporate bonds (2) |  | — |  |  | 1,079 |  |  | — |  |  | 1,079 |
Short-term investments |  | 166 |  |  | 69 |  |  | — |  |  | 235 |
Free-standing derivatives: |  |  |  |  |  |  |  |
Assets |  | — |  |  | 3 |  |  | — |  |  | 3 |
Liabilities |  | (4) |  |  | (6) |  |  | — |  |  | (10) |
Bank loans |  | — |  |  | — |  |  | 78 |  |  | 78 |
Total plan assets at fair value |  | $ | 1,586 |  |  | $ | 1,278 |  |  | $ | 78 |  |  | $ | 2,942 |
% of total plan assets at fair value |  | 53.9 | % |  | 43.4 | % |  | 2.7 | % |  | 100.0 | %
Investments measured using the net asset value practical expedient |  |  |  |  |  |  |  | 1,559 |
Securities lending obligation (3) |  |  |  |  |  |  |  | (124) |
Derivatives counterparty and cash collateral netting |  |  |  |  |  |  |  | (1) |
Other net plan assets (4) |  |  |  |  |  |  |  | 38 |
Total reported plan assets |  |  |  |  |  |  |  | $ | 4,414 |
Fair values of pension plan assets as of December 31, 2024
($ in millions) |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |  | Balance as of December 31, 2024
Equity securities |  | $ | 106 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 107 |
Fixed income securities: |  |  |  |  |  |  |  |
Government bonds (1) |  | 1,401 |  |  | 124 |  |  | — |  |  | 1,525 |
Corporate bonds (2) |  | — |  |  | 985 |  |  | — |  |  | 985 |
Short-term investments |  | 78 |  |  | 142 |  |  | — |  |  | 220 |
Free-standing derivatives: |  |  |  |  |  |  |  |
Assets |  | — |  |  | 9 |  |  | — |  |  | 9 |
Liabilities |  | (3) |  |  | (9) |  |  | — |  |  | (12) |
Bank loans |  | — |  |  | — |  |  | 81 |  |  | 81 |
Total plan assets at fair value |  | $ | 1,582 |  |  | $ | 1,252 |  |  | $ | 81 |  |  | $ | 2,915 |
% of total plan assets at fair value |  | 54.2 | % |  | 43.0 | % |  | 2.8 | % |  | 100.0 | %
Investments measured using the net asset value practical expedient |  |  |  |  |  |  |  | $ | 1,570 |
Securities lending obligation (3) |  |  |  |  |  |  |  | (158) |
Derivatives counterparty and cash collateral netting |  |  |  |  |  |  |  | (8) |
Other net plan assets (4) |  |  |  |  |  |  |  | 49 |
Total reported plan assets |  |  |  |  |  |  |  | $ | 4,368 |
(1)Includes U.S. government and agencies and foreign government bonds. (2)Includes ABS and MBS securities. (3)The securities lending obligation represents the plan’s obligation to return securities lending collateral received under a securities lending program. The terms of the program allow both the plan and the counterparty the right and ability to redeem/return the securities loaned on short notice. Due to its relatively short-term nature, the outstanding balance of the obligation approximates fair value. (4)Other net plan assets represent cash and cash equivalents, interest and dividends receivable and net receivables related to settlements of investment transactions, such as purchases and sales.
Schedule of Rollforward of Level 3 Plan Assets |
Rollforward of Level 3 plan assets during December 31, 2025
|  |  |  | Actual return on plan assets: |  |  |  |  |  |
($ in millions) |  | Balance as of December 31, 2024 |  | Relating to assets sold during the period |  | Relating to assets still held at the reporting date |  | Purchases, sales and settlements, net |  | Net transfers in (out) of Level 3 |  | Balance as of December 31, 2025
Bank loans |  | $ | 81 |  |  | $ | — |  |  | $ | — |  |  | $ | (3) |  |  | $ | — |  |  | $ | 78 |
Total Level 3 plan assets |  | $ | 81 |  |  | $ | — |  |  | $ | — |  |  | $ | (3) |  |  | $ | — |  |  | $ | 78 |
Rollforward of Level 3 plan assets during December 31, 2024
|  |  |  | Actual return on plan assets: |  |  |  |  |  |
($ in millions) |  | Balance as of December 31, 2023 |  | Relating to assets sold during the period |  | Relating to assets still held at the reporting date |  | Purchases, sales and settlements, net |  | Net transfers in (out) of Level 3 |  | Balance as of December 31, 2024
Bank loans |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 81 |  |  | $ | — |  |  | $ | 81 |
Total Level 3 plan assets |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 81 |  |  | $ | — |  |  | $ | 81 |
Schedule of Estimated Future Benefit Payments Expected to be Paid |
Estimated future benefit payments expected to be paid in the next 10 years
|  | As of December 31, 2025
($ in millions) |  | Pension benefits |  | Postretirement benefits
2026 |  | $ | 478 |  |  | $ | 20 |
2027 |  | 467 |  |  | 18 |
2028 |  | 456 |  |  | 16 |
2029 |  | 452 |  |  | 15 |
2030 |  | 421 |  |  | 13 |
2031-2035 |  | 1,804 |  |  | 48 |
Total benefit payments |  | $ | 4,078 |  |  | $ | 130 |

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