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Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 99
Variable lease cost	40
Total lease costs	139
Operating lease right-of-use assets	1,091
Operating lease liabilities - current	322
Operating lease liabilities - noncurrent	$ 790
Weighted-average remaining lease term	6 years
Weighted-average discount rate	2.30%
Operating cash outflows from operating leases	$ 97
Right-of-use assets obtained in exchange for operating lease liabilities	74
2020	264	$ 352
2021	304	287
2022	217	200
2023	126	111
2024	85	71
After 2024	192	172
Total operating lease payments	1,188	1,193
Total minimum lease payments	1,188	$ 1,193
Less interest	(76)
Present value of lease payments	$ 1,112

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