Consolidated Balance Sheet Statement - USD ($) $ in Millions	Dec. 28, 2019	Dec. 29, 2018
Assets, Current [Abstract]
Cash and cash equivalents	$ 397	$ 321
Accounts receivable, net	1,576	1,375
Inventories	1,226	1,330
Other current assets	232	131
Total current assets	3,431	3,157
Property, net	3,612	3,731
Operating lease, right-of-use assets	541	0
Goodwill	5,861	6,050
Other intangibles, net	2,576	3,361
Investment in unconsolidated entities	404	413
Other Assets	1,139	1,068
Total assets	17,564	17,780
Liabilities, Current [Abstract]
Current maturities of long-term debt	620	510
Notes payable	107	176
Accounts payable	2,387	2,427
Current operating lease liabilities	114	0
Other current liabilities	1,550	1,416
Total current liabilities	4,778	4,529
Long-term debt	7,195	8,207
Operating lease liabilities	433	0
Deferred income taxes	596	730
Pension liability	705	651
Other liabilities	543	504
Commitments and contingencies
Equity [Abstract]
Common stock, $.25 par value, 1,000,000,000 shares authorized Issued: 420,829,201 shares in 2019 and 420,666,780 shares in 2018	105	105
Capital in excess of par value	921	895
Retained earnings	7,859	7,652
Treasury stock, at cost 79,286,171 shares in 2019 and 76,801,314 shares in 2018	(4,690)	(4,551)
Accumulated other comprehensive income (loss)	(1,448)	(1,500)
Total Kellogg Company equity	2,747	2,601
Noncontrolling interests	567	558
Total equity	3,314	3,159
Total liabilities and equity	$ 17,564	$ 17,780