Financial Instruments (Effective Portion of Pre-Tax (Gains)/Losses on Derivative Instruments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 26, 2015
Fair Value/Non-Designated Hedges
Derivatives, Fair Value [Line Items]
Losses/(Gains) Recognized in Income Statement(a)	[1]	$ 127	$ 221
Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Losses/(Gains) Recognized in Accumulated Other Comprehensive Loss		35	95
Losses/(Gains) Reclassified from Accumulated Other Comprehensive Loss into Income Statement(b)	[2]	150	97
Forward Exchange Contracts | Fair Value/Non-Designated Hedges
Derivatives, Fair Value [Line Items]
Losses/(Gains) Recognized in Income Statement(a)	[1]	74	(14)
Forward Exchange Contracts | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Losses/(Gains) Recognized in Accumulated Other Comprehensive Loss		(24)	(112)
Losses/(Gains) Reclassified from Accumulated Other Comprehensive Loss into Income Statement(b)	[2]	(44)	(97)
Interest Rate Contracts | Fair Value/Non-Designated Hedges
Derivatives, Fair Value [Line Items]
Losses/(Gains) Recognized in Income Statement(a)	[1]	105	17
Interest Rate Contracts | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Losses/(Gains) Recognized in Accumulated Other Comprehensive Loss		97	195
Losses/(Gains) Reclassified from Accumulated Other Comprehensive Loss into Income Statement(b)	[2]	187	174
Commodity Contracts | Fair Value/Non-Designated Hedges
Derivatives, Fair Value [Line Items]
Losses/(Gains) Recognized in Income Statement(a)	[1]	(52)	218
Commodity Contracts | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Losses/(Gains) Recognized in Accumulated Other Comprehensive Loss		1	12
Losses/(Gains) Reclassified from Accumulated Other Comprehensive Loss into Income Statement(b)	[2]	7	$ 20
Net Investment Hedging [Member] | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Losses/(Gains) Recognized in Accumulated Other Comprehensive Loss		$ (39)

[1] Foreign exchange derivative losses/gains are primarily included in selling, general and administrative expenses. Interest rate derivative losses/gains are primarily from fair value hedges and are included in interest expense. These losses/gains are substantially offset by decreases/increases in the value of the underlying debt, which are also included in interest expense. Commodity derivative losses/gains are included in either cost of sales or selling, general and administrative expenses, depending on the underlying commodity.

[2] Foreign exchange derivative losses/gains are primarily included in cost of sales. Interest rate derivative losses/gains are included in interest expense. Commodity derivative losses/gains are included in either cost of sales or selling, general and administrative expenses, depending on the underlying commodity.