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Long term debt (Details) - USD ($) $ in Millions |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Aug. 11, 2021 | Jan. 06, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 11, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  | $ 400 | $ 400 | $ 549 | $ 470 |
Long-term Debt, Current Maturities |  |  |  |  | 0 | 160 |  |
Repayments of Long-term Debt |  | $ (20) | $ (140) |  | $ (160) | $ (98) | $ (350) |
issuance of 2028 Bonds | $ 100 |  |  |  |  |  |  |
Issuance of 2034 Bonds | 100 |  |  |  |  |  |  |
Issuance of 2051 Bonds | 150 |  |  |  |  |  |  |
Pollution Control Revenue Bonds at 2,125% |  |  |  |  |  |  |  | $ 98
Pollution Control Revenue Bonds at 2.375% |  |  |  |  |  |  |  | $ 21
Issuance of 2031 Bonds | $ 50 |  |  |  |  |  |  |

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- Definition Issuance of 2034 Bonds + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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