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Lease Obligations (Schedule Of Future Minimum Rental Payments For Operating Leases) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Leases, Operating [Abstract]  
2016 $ 316us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2017 271us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2018 219us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2019 170us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2020 140us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 650us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total minimum lease payments (1) $ 1,766us-gaap_OperatingLeasesFutureMinimumPaymentsDue [1]
[1] Minimum lease payments have not been reduced by minimum sublease rentals of $46 million due under future noncancelable subleases.