Financial Instruments (Fair Values of Financial Assets and Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 26, 2015
Derivatives, Fair Value [Line Items]
Short-term Investments		$ 6,967	$ 2,913
Prepaid Forward Asset Fair Value	[1],[2]	25	27
Deferred compensation	[2],[3]	472	474
Total asset derivatives at fair value	[2],[4]	182	269
Total liability derivatives at fair value	[2],[4]	529	543
Total Financial Assets at Fair Value	[2]	11,851	7,847
Total Financial Liabilities at Fair Value	[2]	1,001	1,017
Assets [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale securities	[2],[5]	82	127
Liability [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale securities	[2],[5]	0	0
Liability [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale securities	[2],[6]	0	0
Assets [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale securities	[2],[6]	11,369	7,231
Derivatives Not Designated As Hedging Instruments Liabilities [Member]
Derivatives, Fair Value [Line Items]
Forward exchange contracts	[2],[7]	15	10
Interest rate derivatives	[2],[8]	0	56
Commodity contracts - other	[2],[9]	26	141
Derivatives not designated as hedging instruments, Liabilities, Total	[2]	41	207
Derivatives Not Designated As Hedging Instruments Assets [Member]
Derivatives, Fair Value [Line Items]
Forward exchange contracts	[2],[7]	2	8
Interest rate derivatives	[2],[8]	0	44
Commodity contracts - other	[2],[9]	61	12
Derivatives not designated as hedging instruments, Assets, Total	[2]	63	64
Derivatives Designated As Cash Flow Hedging Instruments Liabilities [Member]
Derivatives, Fair Value [Line Items]
Forward exchange contracts	[2],[7]	8	6
Interest rate derivatives	[2],[7]	408	311
Commodity contracts - other	[2],[9]	1	7
Derivatives designated as hedging instruments, Liabilities, Total	[2]	417	324
Derivatives Designated As Cash Flow Hedging Instruments Assets [Member]
Derivatives, Fair Value [Line Items]
Forward exchange contracts	[2],[7]	51	76
Interest rate derivatives	[2],[7]	0	0
Commodity contracts - other	[2],[9]	2	0
Derivatives designated as hedging instruments, Assets, Total	[2]	53	76
Derivatives Designated As Fair Value Hedging Instruments Assets [Member]
Derivatives, Fair Value [Line Items]
Interest rate derivatives	[2],[8]	66	129
Derivatives Designated As Fair Value Hedging Instruments Liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest rate derivatives	[2],[8]	71	12
Assets [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale securities		11,451	7,358
Liability [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale securities		0	0
Assets [Member]
Derivatives, Fair Value [Line Items]
Short-term Investments	[2],[10]	193	193
Liability [Member]
Derivatives, Fair Value [Line Items]
Short-term Investments	[2],[10]	0	0
Assets [Member]
Derivatives, Fair Value [Line Items]
Deferred compensation	[2],[3]	0	0
Liability [Member]
Derivatives, Fair Value [Line Items]
Prepaid Forward Asset Fair Value	[1],[2]	0	0
Short-term Investments [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale securities		6,800	2,700
Cash and Cash Equivalents [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale securities		$ 4,600	$ 4,500

[1] Based primarily on the price of our common stock.

[2] Unless otherwise noted, financial assets are classified on our balance sheet within prepaid expenses and other current assets and other assets. Financial liabilities are classified on our balance sheet within accounts payable and other current liabilities and other liabilities. Unless specifically indicated, all financial assets and liabilities are categorized as Level 2 assets or liabilities.

[3] Based on the fair value of investments corresponding to employees’ investment elections.

[4] Unless otherwise noted, derivative assets and liabilities are presented on a gross basis on our balance sheet. Amounts subject to enforceable master netting arrangements or similar agreements which are not offset on the balance sheet as of December 31, 2016 and December 26, 2015 were not material. Collateral received against any of our asset positions was not material.

[5] Based on the price of common stock. Categorized as a Level 1 asset. These equity securities are classified as investments in noncontrolled affiliates.

[6] Based on quoted broker prices or other significant inputs derived from or corroborated by observable market data. As of December 31, 2016, $4.6 billion and $6.8 billion of debt securities were classified as cash equivalents and short-term investments, respectively. As of December 26, 2015, $4.5 billion and $2.7 billion of debt securities were classified as cash equivalents and short-term investments, respectively. All of our available-for-sale debt securities have maturities of one year or less.

[7] Based on recently reported market transactions of spot and forward rates.

[8] Based on LIBOR forward rates. As of December 26, 2015, amounts related to non-designated instruments are presented on a net basis on our balance sheet.

[9] Based on recently reported market transactions, primarily swap arrangements.

[10] Based on the price of index funds. Categorized as a Level 1 asset. These investments are classified as short-term investments and are used to manage a portion of market risk arising from our deferred compensation liability.