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AmeriGas Merger, Acquisitions and Dispositions - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 21, 2019 USD ($) $ / shares shares | Aug. 01, 2019 USD ($) shares | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) propane_distribution_business | Jul. 31, 2020
Statement [Line Items] |  |  |  |  |  |  |
Impairment of assets held-for-sale |  |  |  | $ 52 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | HVAC Business |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Loss on sale of business |  |  | $ 2 |  |  |  |
Jointly Owned Electricity Generation Plant |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Proportionate ownership share, percent (as a percentage) |  |  |  |  |  |  | 5.97%
Merger Sub |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Total cash paid | $ 529 |  |  |  |  |  |
Incentive distribution, distribution | 2,228 |  |  |  |  |  |
After tax transaction costs | 8 |  |  |  |  |  |
Operating expenses | 6 |  |  |  |  |  |
Deferred tax asset, step up in tax basis of the underlying assets | $ 512 |  |  |  | $ 512 |  |
Merger Sub | Common Stock |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Consideration paid (in shares) | shares | 34,612,847 | 34,613,000 |  |  | 34,613,000 |  |
CMG |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
After tax transaction costs |  |  |  |  | $ 15 |  |
Total cash paid |  | $ 1,284 |  |  |  |  |
Merger Agreement, Proposed Consideration One | Merger Sub | Common Stock |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Business combination, consideration transferred, equity interests issuable per acquiree share (in shares) | shares | 0.6378 |  |  |  |  |  |
Merger Agreement, Proposed Consideration Two | Merger Sub | Common Stock |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Business combination, consideration transferred, equity interests issuable per acquiree share (in shares) | shares | 0.500 |  |  |  |  |  |
Merger Agreement, Proposed Consideration Two | Merger Sub | Cash Without Interest |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Business combination, consideration transferred, equity interests issuable per share (in dollars per share) | $ / shares | $ 7.63 |  |  |  |  |  |
Merger Agreement, Proposed Consideration Three | Merger Sub | Cash Without Interest |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Business combination, consideration transferred, equity interests issuable per share (in dollars per share) | $ / shares | $ 35.325 |  |  |  |  |  |
AmeriGas Propane |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Incentive distribution, distribution |  |  |  |  |  | $ 13 |
Total cash paid |  |  |  |  |  | $ 10 |
Number of retail propane distribution businesses acquired | propane_distribution_business |  |  |  |  |  | 2 |
Affiliated Entity | CMG | Pennant |  |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |  |
Percentage of voting interests acquired (as a percentage) |  | 47.00% |  |  | 47.00% |  |

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