Intangible Assets (Schedule of Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 3,440	$ 3,088
Finite-Lived Intangible Assets, Accumulated Amortization	1,737	1,655
Amortizable Intangible Assets, net	1,703	1,433
Amortization of intangible assets	$ 90	81	$ 69
Vital Pharmaceutical, Inc. Termination Notice	3 years
Vital Pharmaceuticals, Inc. Distribution Agreement Useful Life	3 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 642	457
Finite-Lived Intangible Assets, Accumulated Amortization	204	177
Amortizable Intangible Assets, net	$ 438	280
Customer Relationships [Member] | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Customer Relationships [Member] | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	24 years
Acquired Franchise Rights
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 976	846
Finite-Lived Intangible Assets, Accumulated Amortization	173	158
Amortizable Intangible Assets, net	$ 803	688
Acquired Franchise Rights | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	56 years
Acquired Franchise Rights | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	60 years
Brands [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 1,348	1,326
Finite-Lived Intangible Assets, Accumulated Amortization	1,099	1,066
Amortizable Intangible Assets, net	$ 249	260
Brands [Member] | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Brands [Member] | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	40 years
Other Identifiable Intangibles
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 474	459
Finite-Lived Intangible Assets, Accumulated Amortization	261	254
Amortizable Intangible Assets, net	$ 213	$ 205
Other Identifiable Intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Other Identifiable Intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	24 years