Goodwill and Intangible Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Acquired intangible assets disclosures
Total gross carrying amount	$ 4,212	$ 4,361
Total accumulated amortization	(2,129)	(2,073)
Total finite-lived intangible assets - net	2,083	2,288
Non-amortizable intangible assets (primarily tradenames)	643	648
Total intangible assets - net	$ 2,726	2,936
Indefinite lived tradenames years in existence	55 years
Customer related intangible assets
Acquired intangible assets disclosures
Total gross carrying amount	$ 2,301	2,332
Total accumulated amortization	(966)	(874)
Patents
Acquired intangible assets disclosures
Total gross carrying amount	544	561
Total accumulated amortization	(486)	(489)
Other technology-based intangible assets
Acquired intangible assets disclosures
Total gross carrying amount	578	583
Total accumulated amortization	(323)	(292)
Definite-lived tradenames
Acquired intangible assets disclosures
Total gross carrying amount	664	678
Total accumulated amortization	(268)	(256)
Other amortizable intangible assets
Acquired intangible assets disclosures
Total gross carrying amount	125	207
Total accumulated amortization	$ (86)	$ (162)