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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 17 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2012
Minimum
Jun. 30, 2012
Maximum
Jun. 30, 2012
Target [Member]
Jun. 30, 2012
Employee Stock Option [Member]
Jun. 30, 2011
Employee Stock Option [Member]
Jun. 30, 2012
Performance Based Restricted Stock Units [Member]
Jun. 30, 2012
Restricted Stock Rights [Member]
Jun. 30, 2011
Restricted Stock Rights [Member]
Jun. 30, 2012
Market-Based Restricted Stock Units [Member]
Jul. 26, 2012
Equity Plan [Member]
Feb. 28, 2011
Fiscal Year 2011 Repurchase Program [Member]
Jul. 26, 2012
Fiscal Year 2013 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award                            
Unrecognized compensation cost related to stock options           $ 9   $ 1 $ 322   $ 19      
Weighted-average service period           2 years 3 months 18 days     2 years 1 month 6 days          
Weighted-average grant date fair values of awards granted           $ 4.75 $ 7.70              
Weighted-average grant date fair values of restricted stock rights granted                 $ 12.53 $ 22.35 $ 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      
Shares repurchased and retired during the period 4,000,000 32,000,000                        
Repurchase and retirement of common stock $ 71                          
Increase in number of shares authorized                       6,180,000