Segment, Geographical Area, Major Customer and Major Supplier Information (Geographical Information - Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 3,814	$ 4,029
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	1,400	1,483
Asia and Other Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	756	784
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	823	840
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	64	70
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	260	287
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	39	43
Other Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 472	$ 522