Income Taxes (Details) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Income tax expense related to continuing operations	$ 136,000,000	$ 87,000,000
Tax benefit recognized resulting from goodwill impairment		0
Pretax goodwill impairment charges	0	570,000,000
Unrecognized tax benefits	1,071,000,000
Unrecognized tax benefits that would reduce income tax expense and the effective tax rate	$ 887,000,000
European Pharmaceutical Solutions
Segment Reporting Information [Line Items]
Pretax goodwill impairment charges		$ 570,000,000