|
Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Mar. 31, 2014
|
Mar. 31, 2013
|
Mar. 31, 2012
|
|---|---|---|---|---|
| Financial Instruments [Line Items] | ||||
| Cash and cash equivalents | $ 2,068 | $ 1,782 | $ 1,292 | $ 1,293 |