Consolidated Balance Sheet Statement - USD ($) $ in Millions	Jan. 02, 2021	Dec. 28, 2019
Assets, Current [Abstract]
Cash and cash equivalents	$ 435	$ 397
Accounts receivable, net	1,537	1,576
Inventories	1,284	1,226
Other current assets	226	232
Total current assets	3,482	3,431
Property, net	3,713	3,612
Operating lease, right-of-use assets	658	541
Goodwill	5,799	5,861
Other intangibles, net	2,491	2,576
Investment in unconsolidated entities	391	404
Other assets	1,462	1,139
Total assets	17,996	17,564
Liabilities, Current [Abstract]
Current maturities of long-term debt	627	620
Notes payable	102	107
Accounts payable	2,471	2,387
Current operating lease liabilities	117	114
Accrued advertising and promotion	776	641
Other current liabilities	1,145	909
Total current liabilities	5,238	4,778
Long-term debt	6,746	7,195
Operating lease liabilities	520	433
Deferred income taxes	562	596
Pension liability	769	705
Other liabilities	525	543
Commitments and contingencies
Equity [Abstract]
Common stock, $0.25 par value, 1,000,000,000 shares authorized Issued: 420,962,092 shares in 2020 and 420,829,201 shares in 2019	105	105
Capital in excess of par value	972	921
Retained earnings	8,326	7,859
Treasury stock, at cost 77,071,554 shares in 2020 and 79,286,171 shares in 2019	(4,559)	(4,690)
Accumulated other comprehensive income (loss)	(1,732)	(1,448)
Total Kellogg Company equity	3,112	2,747
Noncontrolling interests	524	567
Total equity	3,636	3,314
Total liabilities and equity	$ 17,996	$ 17,564