Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in Total Costs and Operating Expenses (principally SG&A Expenses)	$ 5,008	$ 4,482	$ 15,216	$ 12,868
Decrease in Operating Income	(912)	(634)	(2,635)	(2,003)
Increase in Other Income (Expense)	(102)	(154)	(385)	(394)
Accounts receivable, less allowances	3,852		3,852		$ 3,871	$ 3,879
Inventories	2,982		2,982		2,719	2,971
Other current assets	1,229		1,229		1,100	804
Other Assets	1,173		1,173		1,150	1,227
Contract liabilities	797		797		805	0
Deferred Revenue	0		0		0	719
Other accrued expenses	1,224		1,224		1,695	1,848
Deferred Income Taxes	2,550		2,550		2,711	2,766
Other Long-term Liabilities	2,682		2,682		2,623	2,569
Long-term Obligations	17,760		17,760		18,870	18,873
Retained earnings	17,866		17,866		16,032	15,914
Accumulated other comprehensive items	(2,519)		(2,519)		(2,091)	$ (2,003)
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in Total Costs and Operating Expenses (principally SG&A Expenses)		2		7
Decrease in Operating Income		2		7
Increase in Other Income (Expense)		$ 2		$ 7
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings					(1)
Accumulated other comprehensive items					1
Accounting Standards Update 2016-16 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Assets					(77)
Deferred Income Taxes					(57)
Retained earnings					(20)
Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Long-term Obligations					(3)
Retained earnings					3
Accounting Standard Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Income Taxes					2
Retained earnings					87
Accumulated other comprehensive items					(89)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventories	(329)		(329)
Other current assets	$ 339		$ 339
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, less allowances					(8)
Inventories					(252)
Other current assets					296
Contract liabilities					805
Deferred Revenue					(719)
Other accrued expenses					(153)
Other Long-term Liabilities					54
Retained earnings					$ 49