Equity (Tables)

12 Months Ended

Dec. 30, 2017

Equity [Abstract]

Schedule of Earnings Per Share

(millions, except per share data)	Net income attributable to Kellogg Company		Average shares outstanding	Earnings per share
2017
Basic	$	1,269	348	$	3.65
Dilutive potential common shares			2	(0.03		)
Diluted	$	1,269	350	$	3.62
2016
Basic	$	694	350	$	1.98
Dilutive potential common shares			4	(0.02		)
Diluted	$	694	354	$	1.96
2015
Basic	$	614	354	$	1.74
Dilutive potential common shares			2	(0.02		)
Diluted	$	614	356	$	1.72

Changes in Comprehensive Income

	2017								2016									2015
	Pre-tax			Tax (expense)			After-tax		Pre-tax			Tax (expense)			After-tax			Pre-tax			Tax (expense)			After-tax
	amount			benefit			amount		amount			benefit			amount			amount			benefit			amount
Net income							$	1,269							$	695								$	614
Other comprehensive income:
Foreign currency translation adjustments	$	(34	)	$	113		79		$	(230	)	$	(24	)	$	(254	)	$	(170	)	(26		)	(196		)
Cash flow hedges:
Unrealized gain (loss) on cash flow hedges	—			—			—		(55		)	22			(33		)	8			(3		)	5
Reclassification to net income	9			(3		)	6		11			(6		)	5			(23		)	3			(20		)
Postretirement and postemployment benefits:
Amounts arising during the period:
Net experience gain (loss)	44			(12		)	32		25			(9		)	16			—			—			—
Prior service credit (cost)	—			—			—		(4		)	2			(2		)	63			(24		)	39
Reclassification to net income:
Net experience loss	—			—			—		3			(1		)	2			3			(1		)	2
Prior service cost	1			—			1		5			(1		)	4			9			(3		)	6
Venezuela deconsolidation loss	—			—			—		63			—			63			—			—			—
Other comprehensive income (loss)	$	20		$	98		$	118	$	(182	)	$	(17	)	$	(199	)	$	(110	)	$	(54	)	$	(164	)
Comprehensive income							$	1,387							$	496								$	450
Net income (loss) attributable to noncontrolling interests							—								1									—
Other comprehensive income (loss) attributable to noncontrolling interests							—								—									(1		)
Comprehensive income attributable to Kellogg Company							$	1,387							$	495								$	451

Reclassification out of AOCI

Details about AOCI Components	Amount reclassified from AOCI									Line item impacted within Income Statement
(millions)	2017			2016			2015
Gains and losses on cash flow hedges:
Foreign currency exchange contracts	$	(1	)	$	(14	)	$	(40	)	COGS
Foreign currency exchange contracts	—			(1		)	2			SGA
Interest rate contracts	10			13			3			Interest expense
Commodity contracts	—			13			12			COGS
	$	9		$	11		$	(23	)	Total before tax
	(3		)	(6		)	3			Tax (expense) benefit
	$	6		$	5		$	(20	)	Net of tax
Amortization of postretirement and postemployment benefits:
Net experience loss	$	—		$	3		$	3		(a)
Prior service cost	1			5			9			(a)
	$	1		$	8		$	12		Total before tax
	—			(2		)	(4		)	Tax (expense) benefit
	$	1		$	6		$	8		Net of tax
Venezuela deconsolidation loss	$	—		$	63		$	—		Other (income) expense
Total reclassifications	$	7		$	74		$	(12	)	Net of tax

(a) See Note 10 and Note 11 for further details.

Summary of Accumulated Other Comprehensive Income (Loss)

(millions)	December 30, 2017			December 31, 2016
Foreign currency translation adjustments	$	(1,426	)	$	(1,505	)
Cash flow hedges — unrealized net gain (loss)	(61		)	(67		)
Postretirement and postemployment benefits:
Net experience gain (loss)	34			2
Prior service credit (cost)	(4		)	(5		)
Total accumulated other comprehensive income (loss)	$	(1,457	)	$	(1,575	)