Consolidated Statements of Shareholders' Equity (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Shareholders' Equity [Roll Forward]
Beginning balance	$ 10,387	$ 8,757	$ 7,744
Dividends and other transactions with shareholders	19	(287)	(144)
Treasury shares issued for acquisition	0	103	0
Comprehensive income:
Net income	2,844	1,842	1,155
Defined benefit and other postretirement plans adjustments	(34)	(27)	2
Other	0	(1)	0
Total comprehensive income	2,810	1,814	1,157
Ending balance	$ 13,216	$ 10,387	$ 8,757