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Summary of Significant Accounting Policies Inventories, Net (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventories, Net [Abstract]    
Raw materials $ 450us-gaap_InventoryRawMaterialsNetOfReserves $ 499us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 244us-gaap_InventoryWorkInProcessNetOfReserves 252us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 1,185us-gaap_InventoryFinishedGoodsNetOfReserves 1,151us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories, net $ 1,879us-gaap_InventoryNet $ 1,902us-gaap_InventoryNet