Supplemental Data Supplemental Data (Summary of Accounts Receivable, Net) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
From Customers	$ 2,352	$ 2,231
Other	328	321
Less allowance for doubtful accounts and sales discounts	(78)	(80)
Total	$ 2,602	$ 2,472