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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2022
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 2022, 2021 and 2020:
Grant Date Risk-Free Interest RateVolatility
February 15, 20221.76%27.34%
February 16, 20210.22%27.31%
February 18, 20201.36%15.00%
Stock Compensation expense and tax impacts
202220212020
Millions
Compensation Cost included in O&M Expense$29 $28 $35 
Income Tax Benefit Recognized in Consolidated Statement of Operations$8 $8 $10 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
Changes in RSUs for the year ended December 31, 2022 are summarized as follows:
SharesWeighted
Average Grant
Date Fair Value		Weighted Average
Remaining Years
Contractual Term		Aggregate
Intrinsic Value
Non-vested as of January 1, 2022179,831 $57.83 
Granted265,359 $64.44 
Vested220,825 $62.54 
Canceled/Forfeited8,125 $60.85 
Non-vested as of December 31, 2022216,240 $61.02 1.2$13,249,024 
Share-based Payment Arrangement, Performance Shares, Outstanding Activity
Changes in PSUs for the year ended December 31, 2022 are summarized as follows:
SharesWeighted
Average Grant
Date Fair Value		Weighted Average
Remaining Years
Contractual Term		Aggregate
Intrinsic Value
Non-vested as of January 1, 2022476,354 $59.76 
Granted433,860 $68.90 
Vested467,510 $61.31 
Canceled/Forfeited45,694 $62.08 
Non-vested as of December 31, 2022397,010 $67.65 1.7$24,324,782