Sale of Accounts Receivable - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Apr. 01, 2017	Dec. 31, 2016	Jul. 31, 2016	Apr. 02, 2016
Receivables Sales Agreement | Maximum
Transfer of Financial Assets Accounted for as Sales [Line Items]
Transfers of Accounts Receivable Agreements	$ 700
Receivables Sales Agreement | Sold And Outstanding
Transfer of Financial Assets Accounted for as Sales [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	611	$ 562
Receivables Sales Agreement | Sold Since Inception
Transfer of Financial Assets Accounted for as Sales [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	535			$ 53
Kellogg Funding Company Program
Transfer of Financial Assets Accounted for as Sales [Line Items]
Cash Proceeds Received for Assets Derecognized	303	255
Deferred Purchase Price	50	37
Kellogg Funding Company Program | Maximum
Transfer of Financial Assets Accounted for as Sales [Line Items]
Transfers of Accounts Receivable Agreements			$ 600
Kellogg Funding Company Program | Sold And Outstanding
Transfer of Financial Assets Accounted for as Sales [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	353
Kellogg Funding Company Program | Sold Since Inception
Transfer of Financial Assets Accounted for as Sales [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	595	292
Kellogg Foreign Subsidiaries Other Program
Transfer of Financial Assets Accounted for as Sales [Line Items]
Transfers of Accounts Receivable Agreements	50	$ 124
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	$ 55