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Pension Benefits (Schedule Of Projected Benefit Obligation, Accumulated Benefit Obligation And Fair Value Of Plan Assets For Pension Plans) (Details) (Pension Plans, Defined Benefit [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Pension Plans, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation $ 736 [1] $ 670 [1] $ 625
Accumulated benefit obligation 733 667  
Fair value of plan assets $ 425 $ 410 $ 416
[1] The benefit obligation is the projected benefit obligation.