Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Mar. 31, 2016
Goodwill [Line Items]
Gross Carrying Amount	$ 1,947	$ 1,947
Accumulated Impairment	(1,340)	(1,340)
Net Carrying Value	607	607
North America [Member]
Goodwill [Line Items]
Gross Carrying Amount	1,145	1,145
Accumulated Impairment	(860)	(860)
Net Carrying Value	285	285
Europe [Member]
Goodwill [Line Items]
Gross Carrying Amount	511	511
Accumulated Impairment	(330)	(330)
Net Carrying Value	181	181
South America [Member]
Goodwill [Line Items]
Gross Carrying Amount	291	291
Accumulated Impairment	(150)	(150)
Net Carrying Value	$ 141	$ 141