Equity (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Foreign currency translation adjustments	$ (896)	$ (789)
Cash flow hedges - unrealized net loss	(9)	25
Total accumulated other comprehensive income (loss)	(2,458)	(1,914)
Net Experience Loss [Member]
Postretirement and postemployment benefits	(1,483)	(1,075)
Prior Service Cost [Member]
Postretirement and postemployment benefits	$ (70)	$ (75)