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Long-term Debt Schedule of Long Term Debt Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 11, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
First mortgage Bonds - minimum rate | 1.82% |  |
First Mortgage Bonds, rates range from 2.51% to 9.31%, with a weighted average rate of 4.63% in 2019 and 5.01% in 2018, due at various dates through 2050 | $ 3,180 | $ 2,940 |
Pollution Control Revenue Bonds, 5% rate, due 2033 | 119 | 119 | $ 119
Total long-term debt | 3,299 | 3,059 |
Debt Instrument, Unamortized Discount | (14) | (13) |
Less: current portion of long-term debt | 0 | (160) |
Long-term debt, net of current portion | $ 3,285 | $ 2,886 |
First Mortgage Bonds - maximum rate | 6.88% |  |
Debt, Weighted Average Interest Rate | 4.11% | 4.14% |

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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 + Details
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