Goodwill and Intangible Assets (Acquired Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Acquired intangible assets disclosures    
Total gross carrying amount $ 2,920 $ 2,958
Total accumulated amortization (1,639) (1,646)
Total finite-lived intangible assets - net 1,281 1,312
Non-amortizable intangible assets (primarily tradenames) 115 123
Total intangible assets - net 1,396 1,435
Purchased finite-lived intangible assets 52  
Customer related intangible assets    
Acquired intangible assets disclosures    
Total gross carrying amount 1,339 1,348
Total accumulated amortization (599) (597)
Patents    
Acquired intangible assets disclosures    
Total gross carrying amount 561 581
Total accumulated amortization (457) (472)
Other technology-based intangible assets    
Acquired intangible assets disclosures    
Total gross carrying amount 400 407
Total accumulated amortization (218) (215)
Definite-lived tradenames    
Acquired intangible assets disclosures    
Total gross carrying amount 396 401
Total accumulated amortization (197) (195)
Other amortizable intangible assets    
Acquired intangible assets disclosures    
Total gross carrying amount 224 221
Total accumulated amortization $ (168) $ (167)