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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
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 2021, 2020 and 2019:
Grant Date Risk-Free Interest RateVolatility
February 16, 20210.22%27.31%
February 18, 20201.36%15.00%
February 19, 20192.47%16.74%
Stock Compensation expense and tax impacts
202120202019
Millions
Compensation Cost included in O&M Expense$28 $35 $33 
Income Tax Benefit Recognized in Consolidated Statement of Operations$8 $10 $9 
Activity For Options Exercised
Activity for options exercised for the years ended December 31, 2021, 2020 and 2019 is shown below:
202120202019
 Millions
Total Intrinsic Value of Options Exercised$— $— $5 
Cash Received from Options Exercised$— $— $8 
Tax Benefit Realized from Options Exercised$— $— $1 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
Changes in RSUs for the year ended December 31, 2021 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, 2021222,898 $54.21 
Granted239,249 $58.02 
Vested268,423 $55.00 
Canceled/Forfeited13,893 $57.80 
Non-vested as of December 31, 2021179,831 $57.83 1.2$12,000,123 
Share-based Payment Arrangement, Performance Shares, Outstanding Activity
Changes in PSUs for the year ended December 31, 2021 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, 2021475,841 $54.88 
Granted373,418 $65.57 
Vested337,332 $59.49 
Canceled/Forfeited35,573 $58.08 
Non-vested as of December 31, 2021476,354 $59.76 1.6$31,787,102