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Goodwill and Intangible Assets (Acquired Intangible Assets) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Acquired intangible assets disclosures    
Total gross carrying amount $ 4,376 $ 4,361
Total accumulated amortization (2,143) (2,073)
Total finite-lived intangible assets - net 2,233 2,288
Non-amortizable intangible assets (primarily tradenames) 652 648
Total intangible assets - net $ 2,885 2,936
Indefinite lived tradenames years in existence 55 years  
Customer related intangible assets    
Acquired intangible assets disclosures    
Total gross carrying amount $ 2,341 2,332
Total accumulated amortization (912) (874)
Patents    
Acquired intangible assets disclosures    
Total gross carrying amount 564 561
Total accumulated amortization (496) (489)
Other technology-based intangible assets    
Acquired intangible assets disclosures    
Total gross carrying amount 584 583
Total accumulated amortization (304) (292)
Definite-lived tradenames    
Acquired intangible assets disclosures    
Total gross carrying amount 679 678
Total accumulated amortization (265) (256)
Other amortizable intangible assets    
Acquired intangible assets disclosures    
Total gross carrying amount 208 207
Total accumulated amortization $ (166) $ (162)