Employee Benefit Plans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Research and development	$ 586,000,000	$ 592,000,000	$ 1,729,000,000	$ 1,797,000,000
Pension Contributions			72,000,000	2,008,000,000
Contributions - Defined benefit plans	13,000,000	1,929,000,000	72,000,000	2,008,000,000
Contributions - Defined contribution plans	97,000,000	86,000,000	296,000,000	262,000,000
Selling, general and administrative	1,681,000,000	1,582,000,000	5,151,000,000	4,709,000,000
Other Operating Income	131,000,000	250,000,000	1,303,000,000	1,095,000,000
Non-service pension cost (benefit)	(188,000,000)	(131,000,000)	(571,000,000)	(380,000,000)
Previously Reported [Member]
Defined Benefit Plan Disclosure [Line Items]
Research and development		582,000,000		1,768,000,000
Selling, general and administrative		1,524,000,000		4,544,000,000
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		29,000,000
Selling, general and administrative		58,000,000		165,000,000
Non-service pension cost (benefit)		(131,000,000)		(380,000,000)
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	0	2,000,000,000	0	1,900,000,000
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	94,000,000	94,000,000	280,000,000	280,000,000
Interest cost	274,000,000	281,000,000	831,000,000	838,000,000
Expected return on plan assets	558,000,000	555,000,000	1,683,000,000	1,636,000,000
Amortization of prior service credit	(11,000,000)	(9,000,000)	(31,000,000)	(27,000,000)
Recognized actuarial net loss (gain)	(100,000,000)	(144,000,000)	(302,000,000)	(430,000,000)
Net settlement and curtailment (gain) loss	(3,000,000)	(2,000,000)	0	(1,000,000)
Total net periodic benefit (income) cost	(98,000,000)	(43,000,000)	(301,000,000)	(114,000,000)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1,000,000	2,000,000
Interest cost	7,000,000	9,000,000	19,000,000	22,000,000
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	0	(1,000,000)	(2,000,000)	(1,000,000)
Recognized actuarial net loss (gain)	3,000,000	2,000,000	7,000,000	7,000,000
Net settlement and curtailment (gain) loss	0	0	0	0
Total net periodic benefit (income) cost	4,000,000	6,000,000	11,000,000	16,000,000
Product [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold	9,342,000,000	7,800,000,000	26,512,000,000	23,068,000,000
Product [Member] | Previously Reported [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold		7,750,000,000		22,920,000,000
Product [Member] | Accounting Standards Update 2017-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold		50,000,000		148,000,000
Service [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold	$ 3,194,000,000	3,306,000,000	$ 9,726,000,000	9,338,000,000
Service [Member] | Previously Reported [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold		3,293,000,000		9,300,000,000
Service [Member] | Accounting Standards Update 2017-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of Goods and Services Sold		$ 13,000,000		$ 38,000,000