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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2025
Regulated Operations [Abstract]  
Schedule of generate rate cases and infrastructure surcharges
The table below summarizes the annualized incremental revenues, assuming a constant sales volume and customer count, resulting from general rate case authorizations that became effective during 2025. The amounts include reductions for the amortization of the excess accumulated deferred income taxes (“EADIT”) that are generally offset in income tax expense.
Effective DateAmount
General rate cases by state:
KentuckyDecember 16, 2025$18 
HawaiiAugust 1, 20251 
IowaAugust 1, 2025 (a)13 
MissouriMay 28, 202563 
Indiana, Step IncreaseMay 14, 202517 
VirginiaFebruary 24, 2025 (b)15 
TennesseeJanuary 21, 20251 
IllinoisJanuary 1, 2025105 
California, Step IncreaseJanuary 1, 202517 
Total general rate case authorizations$250 
(a)Interim rates of $5 million were effective May 11, 2024. The Iowa Utilities Commission issued its final order on May 21, 2025.
(b)Interim rates were effective May 1, 2024, and the difference between interim and final approved rates were subject to refund. The Virginia State Corporation Commission issued its final order on February 24, 2025.
The table below summarizes the annualized incremental revenues, assuming a constant sales volume and customer count, resulting from general rate case authorizations that became effective on or after January 1, 2026. The amounts include reductions for the amortization of EADIT that are generally offset in income tax expense.
Effective DateAmount
General rate cases by state:
California, Attrition IncreaseJanuary 1, 2026$14 
Total general rate case authorizations$14 
Schedule of annualized incremental revenues Presented in the table below are annualized incremental revenues, assuming a constant sales volume and customer count, resulting from infrastructure surcharge authorizations that became effective during 2025:
Effective DateAmount
Infrastructure surcharges by state:
New JerseyNovember 29, 2025$26 
PennsylvaniaOctober 1, 20255 
New JerseyMay 30, 202515 
MissouriFebruary 7, 202517 
KentuckyJanuary 1, 20252 
West VirginiaJanuary 1, 20254 
Total infrastructure surcharge authorizations$69 
Presented in the table below are annualized incremental revenues, assuming a constant sales volume and customer count, resulting from infrastructure surcharge authorizations that became effective on or after January 1, 2026:
Effective DateAmount
Infrastructure surcharge filings by state:
PennsylvaniaJanuary 1, 2026$11 
IllinoisJanuary 1, 20265 
Total infrastructure surcharge filings$16 
Schedule of composition of regulatory assets Presented in the table below is the composition of regulatory assets as of December 31:
20252024
Removal costs recoverable through rates$323 $356 
Deferred pension expense276 318 
Customer lead line replacements80 86 
Unamortized debt expense84 84 
Regulatory balancing accounts65 71 
Programmed maintenance expense60 57 
Purchase premium recoverable through rates49 50 
Other195 128 
Total (non-current) regulatory assets1,132 1,150 
Current regulatory assets (a)22 19 
Total regulatory assets$1,154 $1,169 
(a)Current regulatory assets are included in other current assets on the Consolidated Balance Sheets.
Schedule of composition of regulatory liabilities Presented in the table below is the composition of regulatory liabilities as of December 31:
20252024
Income taxes recovered through rates$959 $1,016 
Removal costs recovered through rates248 245 
PFAS Multi-district litigation settlements91 — 
Postretirement benefit liability43 71 
Other75 84 
Total (non-current) regulatory liabilities1,416 1,416 
Current regulatory liabilities (a)24 — 
Total regulatory liabilities$1,440 $1,416 
(a)Current regulatory liabilities, which as of December 31, 2025, primarily consisted of PFAS Multi-district litigation settlements, are included in other current liabilities on the Consolidated Balance Sheets.