Quarterly Financial Data (Unaudited) - Summary of Operating Results (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended													12 Months Ended
	Dec. 31, 2020		Sep. 30, 2020		Jun. 30, 2020		Mar. 31, 2020		Dec. 31, 2019	Sep. 30, 2019		Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 7,298		$ 6,665		$ 5,911		$ 6,707		$ 6,913	$ 6,355		$ 6,062	$ 6,538	$ 26,581	$ 25,868	$ 25,938
Gross profit	2,872		2,792		2,331		2,451		2,759	2,516		2,469	2,593	10,446	10,337	10,352
(Provision)/benefit for income taxes	(344)		(391)		(341)		(148)		(230)	633	[1]	(216)	(189)	(1,224)	(2)	(773)
Gain/(loss) on equity method investment transactions	452		345		121		71		0	0		(25)	23	989	(2)	778
Equity method investment net earnings	110		84		106		121		112	114		109	166	421	501	484
Net earnings	1,159	[1]	1,122	[1]	545	[1]	743	[1]	736	1,431		804	973	3,569	3,944	3,331
Noncontrolling interest earnings	(3)		(3)		(1)		(7)		(3)	(5)		(1)	(6)	(14)	(15)	(14)
Net earnings attributable to Mondelēz International	$ 1,156		$ 1,119		$ 544		$ 736		$ 733	$ 1,426		$ 803	$ 967	$ 3,555	$ 3,929	$ 3,317
Weighted-average shares for basic EPS (in shares)	1,429		1,432		1,431		1,434		1,441	1,445		1,445	1,449	1,431	1,445	1,472
Plus incremental shares from assumed conversions of stock options and long-term incentive plan shares (in shares)	10		10		8		11		12	13		13	12	10	13	14
Weighted-average shares for diluted EPS (in shares)	1,439		1,442		1,439		1,445		1,453	1,458		1,458	1,461	1,441	1,458	1,486
Per share data:
Basic earnings per share attributable to Mondelēz International (in dollars per share)	$ 0.81		$ 0.78		$ 0.38		$ 0.51		$ 0.51	$ 0.99		$ 0.56	$ 0.67	$ 2.48	$ 2.72	$ 2.25
Diluted earnings per share attributable to Mondelēz International (in dollars per share)	0.80		0.78		0.38		0.51		0.50	0.98		0.55	0.66	$ 2.47	$ 2.69	$ 2.23
Dividends declared (in dollars per share)	$ 0.315		$ 0.315		$ 0.285		$ 0.285		$ 0.285	$ 0.285		$ 0.26	$ 0.26
Swiss Tax Administration | Foreign Tax Authority
Effect of Fourth Quarter Events [Line Items]
Net tax deferred benefit from impact of Swiss tax reform										$ 769

[1] The third quarter of 2019 was significantly impacted by the $769 million net deferred tax benefit related to Swiss tax reform. Refer to Note 16, Income Taxes, for more information.