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Long-term Debt and Finance Leases - Put Option Agreement for Senior Debt Issuance (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021 | Dec. 11, 2020
1.841% Senior Secured First Lien Notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 900 |  |
Interest rate, stated percentage | 1.841% |  |
LC Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility |  |  | $ 874
Letter of credit |  | $ 873 |
Pre-capitalized Trust Securities |  |  |
Debt Instrument [Line Items] |  |  |
Sale pre-capitalized trust securities | $ 900 |  |
Delaware Trust |  |  |
Debt Instrument [Line Items] |  |  |
Put option agreement, term | 3 years |  |
Put option agreement, semi-annual Interest rate | 1.65% |  |

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