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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details)	12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 € / shares	Dec. 02, 2014 € / shares
Noncontrolling Interest [Line Items]
Noncontrolling interests	$ 178,000,000	$ 84,000,000
Net income attributable to noncontrolling interests	83,000,000	52,000,000	$ 67,000,000
Celesio
Noncontrolling Interest [Line Items]
Annual recurring compensation (in euro per share) | € / shares					€ 0.83
Dividends paid (in euro per share) | € / shares				€ 0.83
Put right (in dollars per share) | € / shares					€ 22.99
Percentage points					5.00%
Total attribution of net income to the noncontrolling shareholders	44,000,000	44,000,000	62,000,000
Carrying value of noncontrolling interests	1,330,000,000	1,410,000,000	1,500,000,000
Maximum redemption value	$ 1,206,000,000.000	$ 1,280,000,000.00
Percentage of outstanding common shares	76.00%	76.00%
Vantage
Noncontrolling Interest [Line Items]
Fair value of noncontrolling interest	$ 89,000,000
Vantage and ClarusOne Sourcing Services LLC
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	$ 39,000,000	$ 8,000,000	$ 5,000,000

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