Consolidated Statements of Financial Position (Unaudited) (Parenthetical) (USD $) In Millions, except Share data	Sep. 30, 2011	Dec. 31, 2010
Current Assets
Allowance for doubtful accounts	$ 85	$ 93
Equity
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	138,632,324	138,632,324
Common stock, shares outstanding	138,632,324	138,632,324
Common stock, par value	$ 10.00	$ 10.00