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Commitments and Contingencies - Commitments and Guarantees (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Mar. 31, 2015
Commitments:    
Credit facilities commitments with vehicle and industrial equipment dealers $ 1,311 $ 1,137
Minimum lease commitments 60 60
Total commitments 1,371 1,197
Total commitments and guarantees 1,471 1,297
Performance Guarantee [Member] | Putnam and Gibson Counties [Member]    
Commitments:    
Guarantees of affiliate pollution control and solid waste disposal bonds $ 100 $ 100