Segment Reporting - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended				3 Months Ended		12 Months Ended								12 Months Ended														3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010	Jan. 02, 2010	Mar. 31, 2013 Scenario, Forecast	Feb. 08, 2013 Scenario, Forecast	Dec. 31, 2010 One-Time Charge	Dec. 31, 2011 Cash Flow Hedges Interest Rate Contracts	Dec. 31, 2012 Europe	Dec. 31, 2012 Interest expense	Dec. 31, 2011 Cadbury	Dec. 31, 2010 Cadbury	Dec. 31, 2009 Cadbury	Feb. 02, 2010 Cadbury	Dec. 31, 2012 Selling, general and administrative expenses	Dec. 31, 2012 2012-2014 Restructuring Program	Dec. 31, 2012 2012-2014 Restructuring Program Europe	Dec. 31, 2012 Integration Program	Dec. 31, 2011 Integration Program	Dec. 31, 2010 Integration Program	Dec. 31, 2012 Integration Program Europe	Dec. 31, 2012 Customer Concentration Risk	Dec. 31, 2012 Customer Concentration Risk Five Largest Customers	Dec. 31, 2011 Customer Concentration Risk Five Largest Customers	Dec. 31, 2010 Customer Concentration Risk Five Largest Customers	Dec. 31, 2012 Customer Concentration Risk Ten Largest Customers	Dec. 31, 2011 Customer Concentration Risk Ten Largest Customers	Dec. 31, 2010 Customer Concentration Risk Ten Largest Customers	Mar. 31, 2012 Developing Markets	Dec. 31, 2012 Developing Markets
Segment Reporting Information [Line Items]
Number of reporting segment		3
Number of operating segments		5
Largest customer, percentage of net revenues																								15.60%	15.50%	15.10%	24.10%	22.70%	23.20%
Number of customers accounted for 10% or more of net revenue																							No single customer accounted for 10% or more of our net revenues from continuing operations.
Foreign currency exchange rate translation					4.30		6.30								1.595
Foreign currency impacts relating to highly inflationary accounting				$ 115		$ 30		$ 34
Divested in property																														72	72
Pretax gain loss within selling, general and administrative expenses																														55	55
Unrealized gains/(losses) on hedging instruments		1	(36)	38
Restructuring charges		21	61	117													102	6	140	521	646
Implementation costs																	8
Acquisition costs related to Cadbury's corporate charges		1		218						44		251	218	40
Restructuring charges, gross of reversals																			185	521	646
Restructuring charges, reversed																						45
Spin-Off costs		1,053	46								609					407
Acquisition costs related to Cadbury's corporate charges		714	437	511																	155
Proceeds from sale of operations		200		4,039
Pre-tax gain (loss)	107	107
Recognized loss, related to several interest rate swaps									$ 157