Intangible Assets and Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Intangible assets
Weighted Amortizable Life (in years)	13 years		13 years
Gross Carrying Amount	$ 4,764		$ 4,822
Accumulated Amortization	(907)		(824)
Net	3,857		3,998
Indefinite-lived intangible assets in process research & development	18		18
Total intangible assets, net	3,875		4,016
Total intangible assets, gross carrying amount	4,782		4,840
Amortization expense	94	94
2013	376
2014	370
2015	369
2016	360
2017	356
Thereafter	2,138
Customer Relationships
Intangible assets
Weighted Amortizable Life (in years)	15 years		15 years
Gross Carrying Amount	2,715		2,756
Accumulated Amortization	(419)		(377)
Net	2,296		2,379
Assets classified to held for sale and/or divested, intangible assets	9
Accumulated amortization on held for sale intangible assets	1
Intellectual Property
Intangible assets
Weighted Amortizable Life (in years)	11 years		12 years
Gross Carrying Amount	1,754		1,767
Accumulated Amortization	(376)		(342)
Net	1,378		1,425
Other
Intangible assets
Weighted Amortizable Life (in years)	10 years		10 years
Gross Carrying Amount	295		299
Accumulated Amortization	(112)		(105)
Net	$ 183		$ 194