Long-Term Obligations and Other Short-Term Borrowings Narrative (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Aug. 31, 2017
Line of Credit Facility [Line Items]
Carrying Amount of Debt Associated with Divestiture			$ 378
Maturities of existing long-term obligations and other short-term borrowings - 2018			1,001
Maturities of existing long-term obligations and other short-term borrowings-2019			452
Maturities of existing long-term obligations and other short-term borrowings-2020			516
Maturities of existing long-term obligations and other short-term borrowings-2021			1,735
Maturities of existing long-term obligations and other short-term borrowings-2022			526
Maturities of existing long-term obligations and other short-term borrowings-Thereafter			4,783
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			2,000	$ 1,750
Commercial paper
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period			1,700
Line of Credit Facility, Maximum Borrowing Capacity			$ 2,000
1.7% Notes due 2018
Line of Credit Facility [Line Items]
Proceeds from (Repayments of) Notes Payable	$ 400
Patient Recovery Business [Member]
Line of Credit Facility [Line Items]
Proceeds from Notes Payable		$ 5,200