Accounts Receivable and Inventory (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts Receivable And Inventory (Textuals) [Abstract]
Percentage of inventory at FIFO accounted for using the LIFO method	42.00%	40.00%
Allowance for doubtful accounts receivable	$ 48	$ 51
Inventory Disclosure [Abstract]
Raw materials	706	651
Work-in-process	272	229
Finished goods	867	800
Inventories at FIFO	1,845	1,680
Excess of FIFO over LIFO cost	(144)	(116)
Total inventory	$ 1,701	$ 1,564