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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Sep. 30, 2019
Leases [Abstract]      
Operating lease cost $ 98 $ 197  
Variable lease cost 37 77  
Total lease costs 135 274  
Operating lease right-of-use assets 1,088 1,088  
Operating lease liabilities - current 320 320  
Operating lease liabilities - noncurrent $ 773 $ 773  
Weighted-average remaining lease term 6 years 6 years  
Weighted-average discount rate 2.30% 2.30%  
Operating cash outflows from operating leases $ 100 $ 197  
Right-of-use assets obtained in exchange for operating lease liabilities 100 174  
2020 173 173 $ 352
2021 318 318 287
2022 233 233 200
2023 142 142 111
2024 101 101 71
After 2024 200 200 172
Total operating lease payments 1,167 1,167 1,193
Total minimum lease payments 1,167 1,167 $ 1,193
Less interest (74) (74)  
Present value of lease payments $ 1,093 $ 1,093