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Share-Based Compensation (Share-Based Compensation Activity - Nonvested Stock Units) (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Y
Mar. 31, 2012
Y
Mar. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Beginning Balance, Shares 7.4    
Granted, Shares 4.2 4.6 3.3
Vested, Shares (3.3)    
Cancelled or expired, Shares (0.9)    
Ending Balance, Shares 7.4 7.4  
Beginning Balance, Weighted-Average Grant Date Fair Value $ 41    
Granted, Weighted-Average Grant Date Fair Value $ 42 $ 42 $ 42
Vested, Weighted-Average Grant Date Fair Value $ 40 $ 38 $ 35
Cancelled or expired, Weighted-Average Grant Date Fair Value $ 41    
Ending Balance, Weighted-Average Grant Date Fair Value $ 42 $ 41  
Beginning Balance, Weighted-Average Remaining Vesting Term 1.2    
Ending Balance, Weighted-Average Remaining Vesting Term 1.2 1.2