Restructuring (Details 1) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011
2008 Global Restructuring Program [Member] | Separation Costs [Member]
Charges and spending relating to Merger Restructuring Program and 2008 Restructuring Program activities
Restructuring reserve, beginning balance	$ 196
Expense	(8)
(Payments) receipts, net	(13)
Restructuring reserve, ending balance	175
Merger Restructuring Program [Member] | Separation Costs [Member]
Charges and spending relating to Merger Restructuring Program and 2008 Restructuring Program activities
Restructuring reserve, beginning balance	859
Expense	607
(Payments) receipts, net	(257)
Restructuring reserve, ending balance	1,209
2008 Global Restructuring Program [Member] | Accelerated Depreciation [Member]
Charges and spending relating to Merger Restructuring Program and 2008 Restructuring Program activities
Expense	6
Noncash activity	(6)
Restructuring reserve, ending balance	0
Merger Restructuring Program [Member] | Accelerated Depreciation [Member]
Charges and spending relating to Merger Restructuring Program and 2008 Restructuring Program activities
Expense	277
Noncash activity	(277)
Restructuring reserve, ending balance	0
2008 Global Restructuring Program [Member] | Other [Member]
Charges and spending relating to Merger Restructuring Program and 2008 Restructuring Program activities
Expense	7
(Payments) receipts, net	(2)
Noncash activity	(5)
Restructuring reserve, ending balance	0
Merger Restructuring Program [Member] | Other [Member]
Charges and spending relating to Merger Restructuring Program and 2008 Restructuring Program activities
Restructuring reserve, beginning balance	64
Expense	37
(Payments) receipts, net	(71)
Noncash activity	16
Restructuring reserve, ending balance	46
2008 Global Restructuring Program [Member]
Charges and spending relating to Merger Restructuring Program and 2008 Restructuring Program activities
Restructuring reserve, beginning balance	196
Expense	5
(Payments) receipts, net	(15)
Noncash activity	(11)
Restructuring reserve, ending balance	175
Merger Restructuring Program [Member]
Charges and spending relating to Merger Restructuring Program and 2008 Restructuring Program activities
Restructuring reserve, beginning balance	923
Expense	921
(Payments) receipts, net	(328)
Noncash activity	(261)
Restructuring reserve, ending balance	$ 1,255