Employee Benefit Plans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Research and development	$ 589,000,000	$ 619,000,000	$ 1,143,000,000	$ 1,205,000,000
Pension Contributions			59,000,000	79,000,000
Contributions - Defined benefit plans	22,000,000	33,000,000	59,000,000	79,000,000
Contributions - Defined contribution plans	105,000,000	86,000,000	199,000,000	176,000,000
Selling, general and administrative	1,759,000,000	1,590,000,000	3,470,000,000	3,127,000,000
Other Operating Income	941,000,000	257,000,000	1,172,000,000	845,000,000
Non-service pension cost (benefit)	(192,000,000)	(126,000,000)	(383,000,000)	(249,000,000)
Previously Reported [Member]
Defined Benefit Plan Disclosure [Line Items]
Research and development		609,000,000		1,186,000,000
Selling, general and administrative		1,538,000,000		3,020,000,000
Non-service pension cost (benefit)		0		0
Accounting Standards Update 2017-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Research and development		10,000,000		19,000,000
Selling, general and administrative		52,000,000		107,000,000
Non-service pension cost (benefit)		(126,000,000)		(249,000,000)
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	0	0	0	0
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	93,000,000	93,000,000	186,000,000	186,000,000
Interest cost	278,000,000	279,000,000	557,000,000	557,000,000
Expected return on plan assets	562,000,000	541,000,000	1,125,000,000	1,081,000,000
Amortization of prior service credit	(10,000,000)	(9,000,000)	(20,000,000)	(18,000,000)
Recognized actuarial net loss (gain)	(101,000,000)	(143,000,000)	(202,000,000)	(286,000,000)
Net settlement and curtailment (gain) loss	2,000,000	2,000,000	3,000,000	1,000,000
Total net periodic benefit (income) cost	(102,000,000)	(37,000,000)	(203,000,000)	(71,000,000)
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment			(170,000,000)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1,000,000	1,000,000	2,000,000
Interest cost	6,000,000	6,000,000	12,000,000	13,000,000
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	(1,000,000)	0	(2,000,000)	0
Recognized actuarial net loss (gain)	2,000,000	2,000,000	4,000,000	5,000,000
Net settlement and curtailment (gain) loss	0	0	0	0
Total net periodic benefit (income) cost	3,000,000	5,000,000	7,000,000	10,000,000
Product [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold	9,154,000,000	7,957,000,000	17,170,000,000	15,268,000,000
Product [Member] | Previously Reported [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold		7,907,000,000		15,170,000,000
Product [Member] | Accounting Standards Update 2017-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold		50,000,000		98,000,000
Service [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold	$ 3,268,000,000	3,207,000,000	$ 6,532,000,000	6,032,000,000
Service [Member] | Previously Reported [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold		3,193,000,000		6,007,000,000
Service [Member] | Accounting Standards Update 2017-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold		$ 14,000,000		$ 25,000,000