Supplemental Cash Flow Information (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Supplemental Cash Flow Information
United States federal, state and foreign income taxes paid for continuing operations	$ 1,300,000,000	$ 1,600,000,000
Interest Paid	95,000,000	236,000,000
Charges on early debt extinguishment before write-off of deferred debt issuance cost		$ 154,000,000