Income Taxes (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Currently payable
Federal income taxes	$ 592	$ 394	$ 390
Foreign income taxes	18	11	34
Total federal and foreign income taxes currently payable	610	405	424
Change in deferred federal and foreign income taxes	387	57	212
Total federal and foreign income taxes	$ 997	$ 462	$ 636