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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Value of $100 | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | Investment | ​ | ​ | ​ | ​
​ | ​ | SCT | ​ | ​ | ​ | Average | ​ | Comp. | ​ | Based on: | ​ | Net | ​ | ​
​ | ​ | Total | ​ | Comp. | ​ | SCT Total | ​ | Actually | ​ | ​ | ​ | S&P 500 | ​ | Income | ​ | ​
​ | ​ | Comp. | ​ | Actually | ​ | Comp. for | ​ | Paid to | ​ | ​ | ​ | Multi- | ​ | (GAAP) | ​ | Adjusted
​ | ​ | for | ​ | Paid to | ​ | Other | ​ | Other | ​ | Company | ​ | Utilities | ​ | (Millions) | ​ | Operating
Year |  | CEO ($) |  | CEO ($)(1) |  | NEOs ($) |  | NEOs ($)(1) |  | TSR ($) |  | TSR ($) |  | ($) |  | EPS ($)
2022 | ​ | 10,458,218 | ​ | 13,114,345 | ​ | 2,758,157 | ​ | 3,470,373 | ​ | 117.42 | ​ | 108.12 | ​ | 1,083 | ​ | 6.10
2021 | ​ | 11,128,277 | ​ | 18,169,622 | ​ | 3,463,650 | ​ | 4,816,926 | ​ | 116.00 | ​ | 107.50 | ​ | 907 | ​ | 5.99
2020 | ​ | 10,605,622 | ​ | 12,523,751 | ​ | 4,387,339 | ​ | 4,768,267 | ​ | 97.10 | ​ | 94.10 | ​ | 1,368 | ​ | 5.61
​ ​ ​ ​
| (1) | The tables below show the amounts deducted and added to the total compensation listed in the summary compensation table to arrive at the compensation actually paid to the CEO and the other NEOs.
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Chief Executive Officer
​ |  | 2022 |  | 2021* |  | 2020
Deduction for change in actuarial present value of accumulated benefit under defined benefit and actuarial pension plans | ​ | (37,810) | ​ | (1,073,599) | ​ | (892,005)
Addition for aggregate of FY service cost under defined benefit and actuarial service plans | ​ | 381,539 | ​ | 331,385 | ​ | 269,273
Deduction of amounts reported under "Stock Awards" in Summary Compensation Table | ​ | (7,013,377) | ​ | (6,524,979) | ​ | (5,614,868)
Addition of fair value at FY end of all awards granted during FY that are outstanding and unvested at FY end** | ​ | 7,609,697 | ​ | 11,738,385 | ​ | 6,341,699
Addition of change in fair value at FY end (from the end of the prior FY) of any awards granted in a prior FY that are outstanding and unvested at FY end** | ​ | 1,424,801 | ​ | 2,421,441 | ​ | 1,601,297
Addition of change in fair value at vesting date of awards granted in any prior FY for which vesting conditions were satisfied during covered FY** | ​ | 101,128 | ​ | (10,682) | ​ | 84,625
Addition of dollar value of any dividends or other earnings paid on stock awards in the covered FY prior to vesting date | ​ | 190,149 | ​ | 159,392 | ​ | 128,108
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Other NEOs (average)
​ |  | 2022 |  | 2021* |  | 2020
Deduction for change in actuarial present value of accumulated benefit under defined benefit and actuarial pension plans | ​ | (81,237) | ​ | (686,317) | ​ | (1,410,659)
Addition for aggregate of FY service cost under defined benefit and actuarial service plans | ​ | 177,644 | ​ | 242,483 | ​ | 339,090
Deduction of amounts reported under "Stock Awards" in Summary Compensation Table | ​ | (1,451,777) | ​ | (1,373,076) | ​ | (1,506,869)
Addition of fair value at FY end of all awards granted during FY that are outstanding and unvested at FY end** | ​ | 1,632,365 | ​ | 2,495,901 | ​ | 1,606,841
Addition of change in fair value at FY end (from the end of the prior FY) of any awards granted in a prior FY that are outstanding and unvested at FY end** | ​ | 386,428 | ​ | 640,575 | ​ | 1,158,989
Addition of change in fair value at vesting date of awards granted in any prior FY for which vesting conditions were satisfied during covered FY** | ​ | 17,126 | ​ | (3,773) | ​ | 113,301
Addition of dollar value of any dividends or other earnings paid on stock awards in the covered FY prior to vesting date | ​ | 31,666 | ​ | 37,484 | ​ | 80,235
​ |  |
Company Selected Measure Name | Adjusted Operating EPS |  |
Named Executive Officers, Footnote [Text Block] | For each covered fiscal year, these are the names of the CEO and each non-CEO NEO whose compensation is included in the Pay versus Performance table below:
​ | ​ | ​
​ | ​ | ​
Year | CEO | Non-CEO NEOs
2022 | Gerardo Norcia | David Ruud, JoAnn Chavez, Trevor F. Lauer, Mark W. Stiers
2021 | Gerardo Norcia | David Ruud, Trevor F. Lauer, David E. Meador, Mark W. Stiers
2020 | Gerardo Norcia | David Ruud, Peter B. Oleksiak, Gerard M. Anderson, Trevor F. Lauer, David E. Meador
​ |  |
PEO Total Compensation Amount | $ 10,458,218 | $ 11,128,277 | $ 10,605,622
PEO Actually Paid Compensation Amount | $ 13,114,345 | 18,169,622 | 12,523,751
Adjustment To PEO Compensation, Footnote [Text Block] | ​
| (1) | The tables below show the amounts deducted and added to the total compensation listed in the summary compensation table to arrive at the compensation actually paid to the CEO and the other NEOs.
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Chief Executive Officer
​ |  | 2022 |  | 2021* |  | 2020
Deduction for change in actuarial present value of accumulated benefit under defined benefit and actuarial pension plans | ​ | (37,810) | ​ | (1,073,599) | ​ | (892,005)
Addition for aggregate of FY service cost under defined benefit and actuarial service plans | ​ | 381,539 | ​ | 331,385 | ​ | 269,273
Deduction of amounts reported under "Stock Awards" in Summary Compensation Table | ​ | (7,013,377) | ​ | (6,524,979) | ​ | (5,614,868)
Addition of fair value at FY end of all awards granted during FY that are outstanding and unvested at FY end** | ​ | 7,609,697 | ​ | 11,738,385 | ​ | 6,341,699
Addition of change in fair value at FY end (from the end of the prior FY) of any awards granted in a prior FY that are outstanding and unvested at FY end** | ​ | 1,424,801 | ​ | 2,421,441 | ​ | 1,601,297
Addition of change in fair value at vesting date of awards granted in any prior FY for which vesting conditions were satisfied during covered FY** | ​ | 101,128 | ​ | (10,682) | ​ | 84,625
Addition of dollar value of any dividends or other earnings paid on stock awards in the covered FY prior to vesting date | ​ | 190,149 | ​ | 159,392 | ​ | 128,108
​ |  |
Non-PEO NEO Average Total Compensation Amount | $ 2,758,157 | 3,463,650 | 4,387,339
Non-PEO NEO Average Compensation Actually Paid Amount | $ 3,470,373 | 4,816,926 | 4,768,267
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] |
| (1) | The tables below show the amounts deducted and added to the total compensation listed in the summary compensation table to arrive at the compensation actually paid to the CEO and the other NEOs.
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Other NEOs (average)
​ |  | 2022 |  | 2021* |  | 2020
Deduction for change in actuarial present value of accumulated benefit under defined benefit and actuarial pension plans | ​ | (81,237) | ​ | (686,317) | ​ | (1,410,659)
Addition for aggregate of FY service cost under defined benefit and actuarial service plans | ​ | 177,644 | ​ | 242,483 | ​ | 339,090
Deduction of amounts reported under "Stock Awards" in Summary Compensation Table | ​ | (1,451,777) | ​ | (1,373,076) | ​ | (1,506,869)
Addition of fair value at FY end of all awards granted during FY that are outstanding and unvested at FY end** | ​ | 1,632,365 | ​ | 2,495,901 | ​ | 1,606,841
Addition of change in fair value at FY end (from the end of the prior FY) of any awards granted in a prior FY that are outstanding and unvested at FY end** | ​ | 386,428 | ​ | 640,575 | ​ | 1,158,989
Addition of change in fair value at vesting date of awards granted in any prior FY for which vesting conditions were satisfied during covered FY** | ​ | 17,126 | ​ | (3,773) | ​ | 113,301
Addition of dollar value of any dividends or other earnings paid on stock awards in the covered FY prior to vesting date | ​ | 31,666 | ​ | 37,484 | ​ | 80,235
​ |  |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] | ​ - |  |
Compensation Actually Paid vs. Net Income [Text Block] | ​ ​ |  |
Compensation Actually Paid vs. Company Selected Measure [Text Block] | ​ ​ |  |
Tabular List [Table Text Block] | Listed below are the most important financial performance measures we used in 2022 to link executive compensation to company performance:
■ Adjusted Operating Earnings Per Share
■ Relative Total Shareholder Return vs Peer Group (percentile)
■ Cash from Operations
​ |  |
Total Shareholder Return Amount | $ 117.42 | 116.00 | 97.10
Peer Group Total Shareholder Return Amount | 108.12 | 107.50 | 94.10
Net Income (Loss) | $ 1,083,000,000 | $ 907,000,000 | $ 1,368,000,000
Company Selected Measure Amount | 6.10 | 5.99 | 5.61
PEO Name | Gerardo Norcia |  |
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Adjusted Operating Earnings Per Share |  |
Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Relative Total Shareholder Return vs Peer Group (percentile) |  |
Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Cash from Operations |  |
PEO [Member] | Deduction for change in actuarial present value of accumulated benetit under defined benefit and actuarial pension plans |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ (37,810) | $ (1,073,599) | $ (892,005)
PEO [Member] | Addition for aggregate of FY service cost under defined benefit and actuarial service plans |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 381,539 | 331,385 | 269,273
PEO [Member] | Deduction of amounts reported under "Stock Awards" in Summary Compensation Table |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (7,013,377) | (6,524,979) | (5,614,868)
PEO [Member] | Addition of fair value at FY end of all awards granted during FY that are outstanding and unvested at FY end |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 7,609,697 | 11,738,385 | 6,341,699
PEO [Member] | Addition of change in fair value at FY end (from the end of the prior FY) of any award granted in a prior FY that are outstanding and unvested at FY end |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 1,424,801 | 2,421,441 | 1,601,297
PEO [Member] | Addition of change in fair value at vesting date of awards granted in any prior FY for which vesting conditions were satisfied during covered FY |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 101,128 | (10,682) | 84,625
PEO [Member] | Addition of dollar value of any dividends or other earnings paid on stock awards in the covered FY prior to vesting date |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 190,149 | 159,392 | 128,108
Non-PEO NEO [Member] | Deduction for change in actuarial present value of accumulated benetit under defined benefit and actuarial pension plans |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (81,237) | (686,317) | (1,410,659)
Non-PEO NEO [Member] | Addition for aggregate of FY service cost under defined benefit and actuarial service plans |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 177,644 | 242,483 | 339,090
Non-PEO NEO [Member] | Deduction of amounts reported under "Stock Awards" in Summary Compensation Table |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (1,451,777) | (1,373,076) | (1,506,869)
Non-PEO NEO [Member] | Addition of fair value at FY end of all awards granted during FY that are outstanding and unvested at FY end |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 1,632,365 | 2,495,901 | 1,606,841
Non-PEO NEO [Member] | Addition of change in fair value at FY end (from the end of the prior FY) of any award granted in a prior FY that are outstanding and unvested at FY end |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 386,428 | 640,575 | 1,158,989
Non-PEO NEO [Member] | Addition of change in fair value at vesting date of awards granted in any prior FY for which vesting conditions were satisfied during covered FY |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 17,126 | (3,773) | 113,301
Non-PEO NEO [Member] | Addition of dollar value of any dividends or other earnings paid on stock awards in the covered FY prior to vesting date |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 31,666 | $ 37,484 | $ 80,235

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