Supplemental Cash Flow Information (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Supplemental Cash Flow Information
U.S. federal, state and foreign income taxes paid for continuing operations	$ 2,200	$ 1,900
U.S. federal, state, and foreign income taxes paid (received) related to discontinued operations	0	43
Interest paid	292	108
Charges on debt extinguishment before write-off of deferred debt issuance cost	$ 154