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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Supplemental Cash Flow Information
United States federal, state and foreign income taxes paid	$ 501	$ 584
Interest Paid	72	213
Charges on debt extinguishment before write-off of deferred debt issuance cost		$ 154

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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