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Discontinued Operations - Summary of Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on sale     $ (6)    
Loss from discontinued operations, net of tax $ 5 $ (10)   $ (11) $ (32)
Discontinued Operations, Held-For-Sale or Disposed Of By Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Revenues 381 523   1,246 1,742
Cost of sales (341) (479)   (1,123) (1,565)
Operating expenses (36) (66)   (128) (214)
Other income (loss), net (7) (4)   (21) (10)
Pre-tax loss from discontinued operations (3) (26)   (26) (47)
Loss on sale 0 0   0 (6)
Income tax benefit 8 16   15 21
Loss from discontinued operations, net of tax $ 5 $ (10)   $ (11) $ (32)