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Long term debt (Tables) | 12 Months Ended
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Dec. 31, 2021
Long-term Debt, Unclassified [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | Long-term debt consists of the following (in millions):
| As of December 31,
| 2021 |  | 2020
First Mortgage Bonds, rates range from 1.82% to 6.88%, with a weighted average rate of 4.11%% in 2021 and 4.14% in 2020, due at various dates through 2051 | $ | 3,180 |  |  | $ | 2,940 |
Pollution Control Revenue Bonds, rates at 2.13% and 2.38%, due 2033 | 119 |  |  | 119 |
Total long-term debt | 3,299 |  |  | 3,059 |
Less: Unamortized debt expense | (14) |  |  | (13) |
Less: Current portion of long-term debt | — |  |  | (160) |
Long-term debt, net of current portion | $ | 3,285 |  |  | $ | 2,886 |
Schedule of Maturities of Long-term Debt [Table Text Block] | As of December 31, 2021, the future minimum principal payments on long-term debt are as follows (in millions):
Years ending December 31: |  |
2022 |  | $ | — |
2023 |  | — |
2024 |  | 80 |
2025 |  | — |
2026 |  | — |
Thereafter |  | 3,219 |
|  | $ | 3,299 |

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