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Leases (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 97	$ 294
Variable lease cost	36	113
Total lease costs	133	407
Operating lease right-of-use assets	1,127	1,127
Operating lease liabilities - current	322	322
Operating lease liabilities - noncurrent	$ 820	$ 820
Weighted-average remaining lease term	6 years	6 years
Weighted-average discount rate	2.30%	2.30%
Operating cash outflows from operating leases	$ 100	$ 297
Right-of-use assets obtained in exchange for operating lease liabilities	141	315
2020	83	83	$ 352
2021	338	338	287
2022	256	256	200
2023	160	160	111
2024	115	115	71
After 2024	278	278	172
Total operating lease payments	1,230	1,230	1,193
Total minimum lease payments	1,230	1,230	$ 1,193
Less interest	(88)	(88)
Present value of lease payments	$ 1,142	$ 1,142

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