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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 17 Months Ended 1 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Minimum
Sep. 30, 2013
Maximum
Sep. 30, 2013
Market-Based Restricted Stock Units [Member]
Sep. 30, 2013
Market-Based Restricted Stock Units [Member]
Target
Sep. 30, 2013
Employee Stock Option [Member]
Sep. 30, 2013
Restricted Stock Rights [Member]
Sep. 30, 2013
Restricted Stock Rights [Member]
Jul. 31, 2013
Employee Stock [Member]
Jul. 31, 2013
Equity Plan [Member]
Jul. 26, 2012
Equity Plan [Member]
Feb. 28, 2011
Fiscal Year 2011 Repurchase Program [Member]
Jun. 30, 2012
Fiscal Year 2011 Repurchase Program [Member]
Jun. 30, 2012
Fiscal Year 2011 Repurchase Program [Member]
Jul. 31, 2012
Fiscal Year 2013 Repurchase Program [Member]
Sep. 30, 2012
Fiscal Year 2013 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Unrecognized compensation cost related to stock options       $ 20   $ 2 $ 295 $ 295                
Weighted-average service period           2 years 1 month   1 year 11 months                
Weighted-average grant date fair values of restricted stock rights granted       $ 29.52     $ 26.43 $ 22.64                
Percentage range of shares received at vesting based on total stockholder return ("TSR")   0.00% 200.00%                          
Percentage of target of presented shares granted that may potentially vest         100.00%                      
Maximum number of common shares to be earned during the performance period, Grants       1.1                        
Maximum number of common shares to be earned during the performance period, outstanding       2.1                        
Amount of common stock authorized for repurchase                       600     500  
Stock repurchase program, period in force                       18 months        
Stock repurchased and retired during period, shares 12.7                       4.0 32.0   8.0
Repurchase and retirement of common stock $ 179                       $ 71     $ 108
Increase in number of shares authorized                 7 18            
Maximum number of shares authorized that may be cover under equity plan to new employees hire in the fiscal year                   4 2