Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Share-based Payment Award, Valuation Assumptions

The following table provides the assumptions used to calculate the grant date fair value of the TSR portion of the PSU awards for 2024, 2023 and 2022:

Grant Date	Risk-Free Interest Rate	Volatility
February 13, 2024	4.35%	20.32%
February 14, 2023	4.24%	25.09%
February 15, 2022	1.76%	27.34%

Stock Compensation Expense and Tax Impacts

	2024		2023		2022
	Millions
Compensation Cost included in O&M Expense	$	40	$	18	$	29
Income Tax Benefit Recognized in Consolidated Statements of Operations	$	11	$	5	$	8

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity

Changes in RSUs for the year ended December 31, 2024 are summarized as follows:

	Shares		Weighted Average Grant Date Fair Value		Weighted Average Remaining Years Contractual Term		Aggregate Intrinsic Value
Non-vested as of January 1, 2024		263,181	$	61.79
Granted		431,944	$	59.22
Vested		232,259	$	58.61
Canceled/Forfeited		14,076	$	59.94
Non-vested as of December 31, 2024		448,790	$	61.03		0.9	$	37,918,251

Share-based Payment Arrangement, Performance Shares, Outstanding Activity

Changes in PSUs for the year ended December 31, 2024 are summarized as follows:

	Shares		Weighted Average Grant Date Fair Value		Weighted Average Remaining Years Contractual Term		Aggregate Intrinsic Value
Non-vested as of January 1, 2024		482,416	$	68.31
Granted		371,438	$	65.44
Vested		359,232	$	67.65
Canceled/Forfeited		20,769	$	67.74
Non-vested as of December 31, 2024		473,853	$	66.59		1.6	$	40,035,812