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Other (Income) Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Component of Other Income / Expense of Nonoperating [Line Items]
Interest income		$ (14)	$ (75)	$ (39)	$ (164)
Interest expense		209	233	421	442
Exchange losses		24	27	78	128
Income from investments in equity securities, net (1)		(551)	(58)	(603)	(32)
Net periodic defined benefit plan (credit) cost other than service cost		(80)	(140)	(170)	(281)
Other, net		22	153	(5)	234
Other (income) expense, net		$ (390)	$ 140	$ (318)	$ 327
Forecast
Component of Other Income / Expense of Nonoperating [Line Items]
Income from investments in equity securities, net (1)	$ 300

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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