CONSOLIDATED BALANCE SHEETS Parentheticals (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Accounts and notes receivable, allowance for doubtful accounts	$ 168	$ 219
Common shares, par value	$ 2	$ 2
Common shares, shares authorized	6,500,000,000	6,500,000,000
Common shares, shares issued	2,997,000,000	2,996,000,000