Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (unaudited) - Narrative (Details)

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Selected Quarterly Financial Data (unaudited) - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds received from insurance relating to property and casualty damage claims   $ 486,000,000   $ 486,000
Proceeds from federal relief grants   15,597,000,000 $ 4,629,000 $ 15,597,000
Pension expense   935,000,000    
Discontinued Operations, Held-for-sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of assets $ 27,470,000,000 $ 13,166,000,000    
Grove Management Services        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating revenue 3,246,000,000      
Operating expenses $ 2,951,000,000