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Commitments and Contingencies 1 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Future minimum lease payments under non-cancelable operating leases  
2014 $ 97
2015 86
2016 68
2017 56
2018 50
Thereafter 140
Total 497
Less income from sublease (24)
Net minimum operating lease payments $ 473