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Pensions and Other Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Pension and Other Postretirement Benefit Obligations and Plan Assets
Pension and Other Postretirement Benefit Obligations and Plan Assets

Pension BenefitsOther Postretirement
Benefits
 2025202420252024
 ($ in millions)
Change in benefit obligations:    
Benefit obligation at beginning of year$2,038 $2,151 $278 $310 
Service cost24 26 3 4 
Interest cost107 107 14 15 
Actuarial (gains) losses80 (91)17 (21)
Benefits paid(155)(155)(31)(32)
Curtailment— — — 2 
Benefit obligation at end of year2,094 2,038 281 278 
Change in plan assets:    
Fair value of plan assets at beginning of year2,551 2,503 145 138 
Actual return on plan assets347 181 19 21 
Employer contributions23 22 23 18 
Benefits paid(155)(155)(31)(32)
Fair value of plan assets at end of year2,766 2,551 156 145 
Funded status at end of year$672 $513 $(125)$(133)
Amounts recognized in the Consolidated Balance Sheets:     
Other assets$949 $786 $— $— 
Other current liabilities(22)(21)— — 
Other liabilities(255)(252)(125)(133)
Net amount recognized$672 $513 $(125)$(133)
Amounts included in accumulated other comprehensive    
loss (before tax):    
Net (gain) loss$395 $488 $(47)$(56)
Prior service benefit(4)(4)(91)(113)
Schedule of Pension and Other Postretirement Benefit Cost Components
Pension and Other Postretirement Benefit Cost Components

 202520242023
 ($ in millions)
Pension benefits:   
Service cost$24 $26 $25 
Interest cost107 107 108 
Expected return on plan assets(196)(203)(208)
Amortization of net losses22 17 4 
Amortization of prior service benefit— (1)(1)
Net benefit$(43)$(54)$(72)
Other postretirement benefits:   
Service cost$3 $4 $4 
Interest cost14 15 17 
Expected return on plan assets(9)(11)(11)
Amortization of net gains(2)(1)— 
Amortization of prior service benefit(22)(23)(26)
Curtailment gain— (20)— 
Net benefit$(16)$(36)$(16)
Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income

 2025
Pension
Benefits		Other
Postretirement 
Benefits
 ($ in millions)
Net (gains) losses arising during the year$(71)$7 
Amortization of net gains (losses)(22)2 
Amortization of prior service benefit— 22 
Total recognized in other comprehensive income$(93)$31 
  
Total recognized in net periodic cost and other comprehensive income$(136)$15 
Schedule of Pension and Other Postretirement Benefit Assumptions A summary of the major assumptions follows:
 202520242023
Pension funded status:   
Discount rate5.51%5.73%5.23%
Future salary increases4.44%4.44%4.44%
Other postretirement benefits funded status:   
Discount rate5.10%5.52%5.11%
Pension cost:   
Discount rate - service cost5.99%5.41%5.75%
Discount rate - interest cost5.40%5.10%5.40%
Return on assets in plans8.00%8.00%8.00%
Future salary increases4.44%4.44%4.44%
Other postretirement benefits cost:   
Discount rate - service cost
5.69%5.81%5.56%
Discount rate - interest cost5.25%5.58%5.23%
Return on assets in plans7.75%7.75%7.75%
Health care trend rate6.50%6.50%7.00%
Schedule of Pension Plan Weighted-Average Asset Allocations, By Asset Category
Our pension plan’s weighted-average asset allocations, by asset category, were as follows:

Percentage of Plan
Assets at December 31,
 20252024
Domestic equity securities51%52%
Debt securities25%25%
International equity securities23%22%
Cash and cash equivalents1%1%
Total100%100%
Schedule of Fair Value of Plan Assets
The following table sets forth the pension plan’s assets by valuation technique level, within the fair value hierarchy. There were no level 3 valued assets at December 31, 2025 or 2024.

 December 31, 2025
 Level 1Level 2Total
 ($ in millions)
Common stock$1,107 $— $1,107 
Common collective trusts:   
Debt securities— 675 675 
Domestic equity securities— 380 380 
International equity securities— 294 294 
Commingled funds— 280 280 
Fixed income securities:
Government and agencies securities— 4 4 
Cash and cash equivalents26 — 26 
Total investments$1,133 $1,633 $2,766 
 December 31, 2024
 Level 1Level 2Total
 ($ in millions)
Common stock$1,054 $— $1,054 
Common collective trusts:   
Debt securities— 637 637 
International equity securities— 362 362 
Domestic equity securities— 346 346 
Commingled funds— 123 123 
Fixed income securities:
Government and agencies securities— 4 4 
Cash and cash equivalents25 — 25 
Total investments$1,079 $1,472 $2,551 
Schedule of Estimated Future Benefit Payments
Benefit payments, which reflect expected future service, as appropriate, are expected to be paid as follows:

Pension
Benefits
Other
Postretirement 
Benefits
 ($ in millions)
2026$153 $34 
2027150 28 
2028148 27 
2029147 26 
2030147 25 
Years 2031 – 2035737 118