v3.25.2
Accumulated Other Comprehensive Income
 6 Months Ended
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income
 
Other comprehensive income refers to revenues, expenses, gains, and losses that under generally accepted accounting principles are included in accumulated other comprehensive income, a component of equity within the Consolidated Balance Sheets, rather than net income on the Consolidated Statements of Income. Under existing accounting standards, other comprehensive income may include, among other things, unrecognized gains and losses and prior service credit related to pension and other postretirement benefit plans.

The following table provides the components of accumulated other comprehensive income (loss) (AOCI) by component (in millions):
Pension and Retiree Health and Welfare Benefit ItemsEquity Method InvestmentsAccumulated Other Comprehensive Income (Loss)
Balance as of December 31, 2023$226 $8 $234 
Other comprehensive income (loss), net before reclassifications— 1 1 
Amounts reclassified from AOCI:
    Amortization of actuarial (gains) lossesa
(10)— (10)
    Tax expense (benefit)2 — 2 
Balance as of June 30, 2024$218 $9 $227 
Balance as of December 31, 2024$572 $9 $581 
Other comprehensive income (loss), net before reclassifications— 1 1 
Amounts reclassified from AOCI:
    Amortization of actuarial (gains) lossesa
(15)— (15)
    Tax expense (benefit)3 — 3 
Balance as of June 30, 2025$560 $10 $570 
a     This accumulated other comprehensive income component is included in the computation of net periodic pension and retiree health and welfare costs (see Note 7 for additional details on pension costs).