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Stock Based Compensation (Tables) | 12 Months Ended
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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 Rate |  | Volatility |
| February 16, 2021 |  | 0.22% |  | 27.31% |
| February 18, 2020 |  | 1.36% |  | 15.00% |
| February 19, 2019 |  | 2.47% |  | 16.74% |
Stock Compensation expense and tax impacts |
|  |  | 2021 |  | 2020 |  | 2019 |
|  |  | 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:
|  |  | 2021 |  | 2020 |  | 2019 |
|  |  | 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:
|  |  | Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Years Contractual Term |  | Aggregate Intrinsic Value |
| Non-vested as of January 1, 2021 |  | 222,898 |  |  | $ | 54.21 |  |  |  |  |  |
| Granted |  | 239,249 |  |  | $ | 58.02 |  |  |  |  |  |
| Vested |  | 268,423 |  |  | $ | 55.00 |  |  |  |  |  |
| Canceled/Forfeited |  | 13,893 |  |  | $ | 57.80 |  |  |  |  |  |
| Non-vested as of December 31, 2021 |  | 179,831 |  |  | $ | 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:
|  |  | Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Years Contractual Term |  | Aggregate Intrinsic Value |
| Non-vested as of January 1, 2021 |  | 475,841 |  |  | $ | 54.88 |  |  |  |  |  |
| Granted |  | 373,418 |  |  | $ | 65.57 |  |  |  |  |  |
| Vested |  | 337,332 |  |  | $ | 59.49 |  |  |  |  |  |
| Canceled/Forfeited |  | 35,573 |  |  | $ | 58.08 |  |  |  |  |  |
| Non-vested as of December 31, 2021 |  | 476,354 |  |  | $ | 59.76 |  |  | 1.6 |  | $ | 31,787,102 |  |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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