v3.25.0.1
Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2024
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in accumulated other comprehensive loss by component for the years ended December 31, 2024, 2023, and 2022, were as follows:
($ in millions)Benefit PlansTotal
Balance as of December 31, 2021$(923)$(923)
Other comprehensive income before reclassifications390 390 
Amounts reclassified from accumulated other comprehensive loss
Amortization of prior service cost1
18 18 
Amortization of net actuarial loss1
32 32 
Settlement gain1
(4)(4)
Tax benefit (expense) for items of other comprehensive income(112)(112)
Net current period other comprehensive income324 324 
Balance as of December 31, 2022(599)(599)
Other comprehensive income before reclassifications221 221 
Amounts reclassified from accumulated other comprehensive loss
Amortization of prior service cost1
15 15 
Amortization of net actuarial loss1
2 2 
Tax expense for items of other comprehensive income(61)(61)
Net current period other comprehensive income177 177 
Balance as of December 31, 2023(422)(422)
Other comprehensive income before reclassifications509 509 
Amounts reclassified from accumulated other comprehensive loss
Amortization of prior service cost1
14 14 
Amortization of net actuarial loss1
5 5 
Tax expense for items of other comprehensive income(134)(134)
Net current period other comprehensive income394 394 
Balance as of December 31, 2024$(28)$(28)
1 These accumulated comprehensive loss components are included in the computation of net periodic benefit cost. See Note 16: Employee Pension and Other Postretirement Benefits. The tax expense recorded in stockholders' equity for the amounts reclassified from accumulated other comprehensive loss for the years ended December 31, 2024, 2023, and 2022, was $5 million, $4 million, and $12 million, respectively.