Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Share-based Payment Award, Valuation Assumptions [Table Text Block]

The following table provides the assumptions used to calculate the grant date fair value of the TSR portion of the PSU awards for 2023, 2022 and 2021:

Grant Date	Risk-Free Interest Rate	Volatility
February 14, 2023	4.24%	25.09%
February 15, 2022	1.76%	27.34%
February 16, 2021	0.22%	27.31%

Stock Compensation expense and tax impacts

	2023		2022		2021
	Millions
Compensation Cost included in O&M Expense	$	18	$	29	$	28
Income Tax Benefit Recognized in Consolidated Statement of Operations	$	5	$	8	$	8

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

Changes in RSUs for the year ended December 31, 2023 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, 2023	216,240	$	61.02
Granted	286,059	$	61.44
Vested	213,504	$	60.61
Canceled/Forfeited	25,614	$	61.21
Non-vested as of December 31, 2023	263,181	$	61.79	1.2	$	16,093,498

Share-based Payment Arrangement, Performance Shares, Outstanding Activity

Changes in PSUs for the year ended December 31, 2023 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, 2023	397,010	$	67.65
Granted	388,658	$	67.99
Vested	253,289	$	66.81
Canceled/Forfeited	49,963	$	68.20
Non-vested as of December 31, 2023	482,416	$	68.31	1.6	$	29,499,703