Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 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)	$ 5,141	$ 4,241	$ 10,208	$ 8,386
Decrease in Operating Income	(937)	(749)	(1,723)	(1,369)
Increase in Other Income (Expense)	(131)	(123)	(283)	(240)
Accounts receivable, less allowances	3,911		3,911		$ 3,871	$ 3,879
Inventories	2,866		2,866		2,719	2,971
Other current assets	1,230		1,230		1,100	804
Other Assets	1,177		1,177		1,150	1,227
Contract liabilities	816		816		805	0
Deferred Revenue	0		0		0	719
Other accrued expenses	1,339		1,339		1,695	1,848
Deferred Income Taxes	2,599		2,599		2,711	2,766
Other Long-term Liabilities	2,670		2,670		2,623	2,569
Long-term Obligations	17,709		17,709		18,870	18,873
Retained earnings	17,226		17,226		16,032	15,914
Accumulated other comprehensive items	(2,491)		(2,491)		(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)		3		5
Decrease in Operating Income		3		5
Increase in Other Income (Expense)		$ 3		$ 5
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	(295)		(295)
Other current assets	$ 335		$ 335
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