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Restructuring, Impairment and Related Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Net restructuring, impairment and related charges recognized	$ 136	$ 110		$ 204	$ 288
Net restructuring, impairment and related charges recognized, after tax	115	92		167	244
Pre-tax impairment charge			$ 20
Impairment of intangible assets			$ 16
Asset impairment Charge, net of tax	30	35
Company recognized a non-cash charge	30	35		113	671
Strategic Growth Initiative Plan
Restructuring Cost and Reserve [Line Items]
Net restructuring, impairment and related charges recognized	3			10
Net restructuring, impairment and related charges recognized, after tax	2			8
Pre-tax charges recorded to-date	145			145
Strategic Growth Initiative Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	140			140
Strategic Growth Initiative Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	180			180
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters
Restructuring Cost and Reserve [Line Items]
Net restructuring, impairment and related charges recognized		31			31
Net restructuring, impairment and related charges recognized, after tax		$ 23			$ 23
Pre-tax charges recorded to-date	67			67
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Employee retention expenses, asset impairments and accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Net restructuring, impairment and related charges recognized	14			34
Net restructuring, impairment and related charges recognized, after tax	10			25
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Minimum
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	80			80
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Maximum
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	130			130
Strategic Growth Initiative Plan - Other
Restructuring Cost and Reserve [Line Items]
Pre-tax charges recorded to-date	222			222
Strategic Growth Initiative Plan - Other | Project consulting fee
Restructuring Cost and Reserve [Line Items]
Net restructuring, impairment and related charges recognized	20			59
Net restructuring, impairment and related charges recognized, after tax	15			45
Strategic Growth Initiative Plan - Other | Minimum
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	300			300
Strategic Growth Initiative Plan - Other | Maximum
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	350			350
Other plans
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities	48			48		$ 87
European Pharmaceutical Solutions
Restructuring Cost and Reserve [Line Items]
Asset impairment Charge, net of tax	53			53
Company recognized a non-cash charge	$ 64			$ 64

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