Redeemable Noncontrolling Interests - Narrative (Details) $ in Millions	9 Months Ended
	Dec. 31, 2015 € / shares	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)
Noncontrolling Interest [Abstract]
Annual recurring compensation amount per share (in euros per share) | € / shares	€ 0.83
Put right redemption price per share (in euros per share) | € / shares	€ 22.99
Put right value, interest rate spread (as a percent)		5.00%
Put right specified in domination agreement exercise period	2 months
Carrying value of redeemable noncontrolling interests | $		$ 1,378	$ 1,386
Maximum redemption value of redeemable noncontrolling interest | $		$ 1,220	$ 1,210
Ownership percentage (as a percent)		76.00%	76.00%