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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 17 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2012
Minimum
Sep. 30, 2012
Maximum
Sep. 30, 2012
Target [Member]
Sep. 30, 2012
Employee Stock Option [Member]
Sep. 30, 2011
Employee Stock Option [Member]
Sep. 30, 2012
Employee Stock Option [Member]
Sep. 30, 2011
Employee Stock Option [Member]
Sep. 30, 2012
Performance Based Restricted Stock Units [Member]
Sep. 30, 2012
Restricted Stock Rights [Member]
Sep. 30, 2012
Restricted Stock Rights [Member]
Sep. 30, 2012
Market-Based Restricted Stock Units [Member]
Sep. 30, 2012
Market-Based Restricted Stock Units [Member]
Sep. 30, 2011
Market-Based Restricted Stock Units [Member]
Sep. 30, 2012
Employee Stock Purchase Plan [Member]
Sep. 30, 2011
Employee Stock Purchase 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]
Sep. 30, 2012
Fiscal Year 2013 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Weighted-average volatility       42.00% 44.00% 44.00% 43.00%         36.00% 35.00% 41.00% 39.00%              
Unrecognized compensation cost related to stock options       $ 8   $ 8   $ 1 $ 301 $ 301 $ 16 $ 16                    
Weighted-average service period           2 years 2 months 7 days       2 years 0 months 0 days                        
Weighted-average grant date fair values of awards granted       $ 4.36   $ 4.65                                
Weighted-average grant date fair values of restricted stock rights granted                 $ 12.43 $ 12.51   $ 10.45                    
Percentage range of shares received at vesting based on total stockholder return ("TSR") 0.00% 200.00% 100.00%                                      
Amount of common stock authorized for repurchase                                 600     500    
Maximum number of common shares to be earned during the performance period                     2,000,000                      
Repurchase and retirement of common stock                                   $ 71     $ 108 $ 179
Stock Repurchased and Retired During Period, Shares                                   4,300,000 32,000,000   8,400,000 12,700,000
Increase in number of shares authorized                               6,180,000