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Stock Based Compensation (Tables) | 12 Months Ended
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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 |  |

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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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Name Accounting Standards Codification -Section 50 -Subparagraph (c) -Paragraph 2 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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