Restructuring Related Activities 2010 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		50 Months Ended	3 Months Ended		38 Months Ended	3 Months Ended		50 Months Ended	3 Months Ended		38 Months Ended	3 Months Ended					50 Months Ended	3 Months Ended	38 Months Ended	3 Months Ended		50 Months Ended	3 Months Ended		38 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2013 2010 Restructuring Plan [Member]	Mar. 31, 2012 2010 Restructuring Plan [Member]	Mar. 31, 2013 2010 Restructuring Plan [Member]	Mar. 31, 2013 Termination Benefits [Member]	Mar. 31, 2012 Termination Benefits [Member]	Mar. 31, 2013 Termination Benefits [Member]	Mar. 31, 2013 Termination Benefits [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2012 Termination Benefits [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Termination Benefits [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Accelerated depreciation [Member]	Mar. 31, 2012 Accelerated depreciation [Member]	Mar. 31, 2013 Accelerated depreciation [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Transfer costs [Member]	Mar. 31, 2012 Transfer costs [Member]	Mar. 31, 2013 Transfer costs [Member]	Mar. 31, 2013 Transfer costs [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Transfer costs [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Other [Member]	Mar. 31, 2012 Other [Member]	Mar. 31, 2013 Other [Member]	Mar. 31, 2013 Other [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2012 Other [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Other [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Impairment of an asset in value [Member]	Mar. 31, 2012 Impairment of an asset in value [Member]	Mar. 31, 2013 Impairment of an asset in value [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Restructuring Plan [Member] Termination Benefits [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Restructuring Plan [Member] Other [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Restructuring Plan [Member] Impairment of an asset in value [Member] 2010 Restructuring Plan [Member]	Mar. 31, 2013 Restructuring Related To Plan [Member] Other [Member] 2010 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Cost Incurred to Date			$ 490			$ 160
Impact of restructuring costs on the accompanying financial statements
Restructuring plan estimated future cash outflow				145
Cash payments associated with restructuring initiatives	47		422	0		145	23		204	0		89				0		73			24		145			56
Restructuring and Related Cost, Incurred Cost	15	17		0	(1)		8	(1)		0	(2)		1	0		0	4				23	14			1		(17)
Expected total costs associated with the plan				$ 160																										$ 90	$ 51	$ 11	$ 8