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Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions			12 Months Ended
	Aug. 16, 2018	Aug. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2017
Subsequent Event [Line Items]
Initial Ownership Interest Before Sale						98.00%
Payments for Repurchase of Common Stock			$ 550	$ 600	$ 651
naviHealth [Member] | Subsequent Event
Subsequent Event [Line Items]
Initial Ownership Interest Before Sale		98.00%
Proceeds from Divestiture of Businesses		$ 736
Partnership Indirect Ownership		100.00%
Common Shares | Subsequent Event
Subsequent Event [Line Items]
Payments for Repurchase of Common Stock	$ 600
Common shares repurchased, amount	9.5
Average price per common share (in usd per share)	$ 50.45

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- Definition

The cash outflow to reacquire common stock during the period.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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