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Quarterly Financial Data (Unaudited)
 12 Months Ended
Mar. 31, 2017
Selected Quarterly Financial Information [Abstract]  
Quarterly Financial Data (Unaudited)
Quarterly Financial Data (Unaudited)
 
Quarter
 
1st
 
2nd
 
3rd
 
4th
 
(in millions, except per share amounts)
Fiscal year 2016
 
 
 
 
 
 
 
Net operating revenues
$
8,012

 
$
8,247

 
$
8,549

 
$
8,539

Operating income
$
361

 
$
622

 
$
311

 
$
470

Net loss
$
(302
)
 
$
(142
)
 
$
(479
)
 
$
(283
)
Basic and diluted loss per common share(1) 
$
(0.08
)
 
$
(0.04
)
 
$
(0.12
)
 
$
(0.07
)
 
 
 
 
 
 
 
 
Fiscal year 2015
 
 
 
 
 
 
 
Net operating revenues
$
8,027

 
$
7,975

 
$
8,107

 
$
8,071

Operating income (loss)
$
501

 
$
(2
)
 
$
(197
)
 
$
8

Net loss
$
(20
)
 
$
(585
)
 
$
(836
)
 
$
(554
)
Basic and diluted loss per common share(1) 
$
(0.01
)
 
$
(0.15
)
 
$
(0.21
)
 
$
(0.14
)
_____________
(1)
The sum of the quarterly earnings per share amounts may not equal the annual amounts because of the changes in the weighted average number of shares outstanding during the year.