Equity (Tables)

12 Months Ended

Dec. 28, 2019

Equity [Abstract]

Changes in Comprehensive Income

	2019									2018									2017
	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							$	977								$	1,344								$	1,254
Other comprehensive income:
Foreign currency translation adjustments	$	100		$	(19	)	81			$	5		$	(53	)	$	(48	)	$	(34	)	113			79
Cash flow hedges:
Unrealized gain (loss) on cash flow hedges	5			(1		)	4			3			(1		)	2			—			—			—
Reclassification to net income	4			(1		)	3			8			(2		)	6			9			(3		)	6
Postretirement and postemployment benefits:
Amounts arising during the period:
Net experience gain (loss)	(16		)	5			(11		)	(8		)	1			(7		)	44			(12		)	32
Prior service credit (cost)	3			(1		)	2			1			—			1			—			—			—
Reclassification to net income:
Net experience (gain) loss	(5		)	1			(4		)	(5		)	1			(4		)	—			—			—
Prior service (credit) cost	(1		)	—			(1		)	—			—			—			1			—			1
Available-for-sale securities:
Unrealized gain (loss)	4			—			4			—			—			—			—			—			—
Reclassification to net income	(4		)	—			(4		)	—			—			—			—			—			—
Other comprehensive income (loss)	$	90		$	(16	)	$	74		$	4		$	(54	)	$	(50	)	$	20		$	98		$	118
Comprehensive income							$	1,051								$	1,294								$	1,372
Net income (loss) attributable to noncontrolling interests							17									8									—
Other comprehensive income (loss) attributable to noncontrolling interests							—									(7		)							—
Comprehensive income attributable to Kellogg Company							$	1,034								$	1,293								$	1,372

Reclassification out of AOCI

Details about AOCI Components	Amount reclassified from AOCI									Line item impacted within Income Statement
(millions)	2019			2018			2017
(Gains) and losses on cash flow hedges:
Foreign currency exchange contracts	$	—		$	—		$	(1	)	COGS
Interest rate contracts	4			8			10			Interest expense
	$	4		$	8		$	9		Total before tax
	(1		)	(2		)	(3		)	Tax expense (benefit)
	$	3		$	6		$	6		Net of tax
Amortization of postretirement and postemployment benefits:
Net experience (gains)	$	(5	)	$	(5	)	$	—		OIE
Prior service (credit) cost	(1		)	—			1			OIE
	$	(6	)	$	(5	)	$	1		Total before tax
	1			1			—			Tax expense (benefit)
	$	(5	)	$	(4	)	$	1		Net of tax
(Gains) losses on available-for-sale securities
Corporate bonds	$	(4	)	$	—		$	—		OIE
	$	(4	)	$	—		$	—		Total before tax
	—			—			—			Tax expense (benefit)
	$	(4	)	$	—		$	—		Net of tax
Total reclassifications	$	(6	)	$	2		$	7		Net of tax

Summary of Accumulated Other Comprehensive Income (Loss)

(millions)	December 28, 2019			December 29, 2018
Foreign currency translation adjustments	$	(1,399	)	$	(1,467	)
Cash flow hedges — unrealized net gain (loss)	(60		)	(53		)
Postretirement and postemployment benefits:
Net experience gain (loss)	7			23
Prior service credit (cost)	4			(3		)
Total accumulated other comprehensive income (loss)	$	(1,448	)	$	(1,500	)