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Lease Obligations (Schedule Of Future Minimum Rental Payments For Operating Leases) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Leases, Operating [Abstract]  
2015 $ 358
2016 299
2017 246
2018 193
2019 168
Thereafter 806
Total minimum lease payments (1) $ 2,070 [1]
[1] Minimum lease payments have not been reduced by minimum sublease rentals of $44 million due under future noncancelable subleases.