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Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2017
Other Income (Expense), Net
Deposit Liabilities, Description	0	0	21		0
External services	$ 2	$ 4	$ 6		$ 8
Interest income	6	6	12		11
Gains (losses) on investments	6	0	(1)		3
Miscellaneous	0	1	0		1
Total other income (expense), net	14	$ 11	38	$ 23	$ 23
Increase in Other Income/Expense	$ 3		$ 15

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Description of the deposits held by the entity, which may include a description of the types and repayment terms of the deposits, the accounting policy for the deposits and the amount of the liabilities recognized for the deposits.

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Amount of realized and unrealized gain (loss) on investment.

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