Segment, Geographical Area, Major Customer and Major Supplier Information (Geographical Information - Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 4,126	$ 4,153
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	1,518	1,504
Asia and Other Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	840	866
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	866	889
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	78	82
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	251	268
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	45	46
Other Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 528	$ 498