Income Taxes (Details)		3 Months Ended		9 Months Ended
	Dec. 11, 2019 USD ($)	Dec. 31, 2019 USD ($) county	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) county	Dec. 31, 2018 USD ($)
Income Tax Contingency [Line Items]
Income tax expense (benefit) related to continuing operations		$ 47,000,000	$ 123,000,000	$ (111,000,000)	$ 245,000,000
Discrete tax benefit recognized		$ 21,000,000		$ 21,000,000
Number of counties that filed claims | county		2		2
Tax benefit on goodwill impairment					0
Pretax goodwill impairment charges		$ 2,000,000	$ 21,000,000	$ 2,000,000	$ 591,000,000
Unrecognized tax benefits		977,000,000		977,000,000
Unrecognized tax benefits that would reduce income tax expense and the effective tax rate		817,000,000		817,000,000
Possible decrease in unrecognized tax benefits during the next twelve months		51,000,000		51,000,000
Planned divestiture in Medical-Surgical Solutions business
Income Tax Contingency [Line Items]
Discrete tax benefit recognized		24,000,000		24,000,000
Settlement with Taxing Authority [Member]
Income Tax Contingency [Line Items]
Discrete tax benefit recognized		20,000,000
Decrease in unrecognized tax benefits		22,000,000
Settlement Agreement with State of California [Member]
Income Tax Contingency [Line Items]
Discrete tax benefit recognized				28,000,000
Decrease in unrecognized tax benefits				91,000,000
Held-for-sale | German Wholesale Joint Venture
Income Tax Contingency [Line Items]
Tax benefit recognized for impairment charge		0		0
Impairment loss	$ 282,000,000	$ 282,000,000		$ 282,000,000