Basis of Presentation and Significant Accounting Policies - Impact of Adoption of Accounting Standards Related to Classification of Certain Transactions in the Statement of Cash Flows (Details) - USD ($) $ in Millions		6 Months Ended
		Jul. 01, 2018	Jul. 02, 2017
Operating Activities
Other adjustments, net	[1]	$ (523)	$ (458)
Other changes in assets and liabilities, net of acquisitions and divestitures	[1]	(3,250)	(3,844)
Investing Activities
Proceeds from redemptions/sales of short-term investments	[1]	10,497	3,517
Proceeds from redemptions/sales of long-term investments	[1]	1,361	1,538
Financing Activities
Principal payments on short-term borrowings	[1]	(2,921)	(5,088)
Net proceeds from short-term borrowings with original maturities of three months or less	[1]	2,092	265
Net increase/(decrease) in cash and cash equivalents and restricted cash and cash equivalents	[1]	1,381	(5)
Cash and cash equivalents and restricted cash and cash equivalents, beginning	[1]	1,431	2,666
Cash and cash equivalents and restricted cash and cash equivalents, end	[1]	2,811	2,661
As Previously Reported [Member]
Operating Activities
Other adjustments, net			(433)
Other changes in assets and liabilities, net of acquisitions and divestitures			(3,853)
Investing Activities
Proceeds from redemptions/sales of short-term investments			3,520
Proceeds from redemptions/sales of long-term investments			1,539
Financing Activities
Principal payments on short-term borrowings			(5,110)
Net proceeds from short-term borrowings with original maturities of three months or less			261
Net increase/(decrease) in cash and cash equivalents and restricted cash and cash equivalents			(10)
Cash and cash equivalents and restricted cash and cash equivalents, beginning			2,595
Cash and cash equivalents and restricted cash and cash equivalents, end			2,585
Cash Flow Classification [Member] | Effect of Change Higher/(Lower) [Member]
Operating Activities
Other adjustments, net			(26)
Financing Activities
Principal payments on short-term borrowings			22
Net proceeds from short-term borrowings with original maturities of three months or less			4
Restricted Cash [Member]
Financing Activities
Net increase/(decrease) in cash and cash equivalents and restricted cash and cash equivalents		$ 19
Restricted Cash [Member] | Effect of Change Higher/(Lower) [Member]
Operating Activities
Other changes in assets and liabilities, net of acquisitions and divestitures			9
Investing Activities
Proceeds from redemptions/sales of short-term investments			(3)
Proceeds from redemptions/sales of long-term investments			(2)
Financing Activities
Net increase/(decrease) in cash and cash equivalents and restricted cash and cash equivalents			5
Cash and cash equivalents and restricted cash and cash equivalents, beginning			70
Cash and cash equivalents and restricted cash and cash equivalents, end			$ 75

[1] Amounts may not add due to rounding.