Intangible Assets and Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Intangible assets
Weighted Amortizable Life (in years)	14 years		13 years
Gross Carrying Amount	$ 4,634		$ 4,748
Accumulated Amortization	(1,143)		(1,170)
Net	3,491		3,578
Indefinite-lived intangible assets - In-process research & development	18		18
Total intangible assets, net	3,509		3,596
Total intangible assets, gross carrying amount	4,652		4,766
Amortization expense	92	94
2014	365
2015	357
2016	335
2017	333
2018	329
Thereafter	1,882
Customer Relationships
Intangible assets
Weighted Amortizable Life (in years)	15 years		15 years
Gross Carrying Amount	2,643		2,653
Accumulated Amortization	(575)		(539)
Net	2,068		2,114
Intellectual Property
Intangible assets
Weighted Amortizable Life (in years)	11 years		11 years
Gross Carrying Amount	1,752		1,821
Accumulated Amortization	(459)		(495)
Net	1,293		1,326
Other
Intangible assets
Weighted Amortizable Life (in years)	11 years		10 years
Gross Carrying Amount	239		274
Accumulated Amortization	(109)		(136)
Net	$ 130		$ 138