Employee Benefit Plans (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Cost of products sold	$ 8,016,000,000	$ 7,311,000,000
Cost of services sold	3,264,000,000	2,825,000,000
Research and development expense	554,000,000	586,000,000
Pension Contributions	37,000,000	46,000,000
Contributions - Defined benefit plans	37,000,000	46,000,000
Contributions - Defined contribution plans	94,000,000	90,000,000
Selling, General and Administrative Expense	1,711,000,000	1,537,000,000
Other Operating Income	231,000,000	588,000,000
Non-service pension cost (benefit)	(191,000,000)	(123,000,000)
Scenario, Previously Reported [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of products sold		7,263,000,000
Cost of services sold		2,814,000,000
Research and development expense		577,000,000
Selling, General and Administrative Expense		1,482,000,000
Other Operating Income		588,000,000
Non-service pension cost (benefit)		0
ASU 2017-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of products sold		48,000,000
Cost of services sold		11,000,000
Research and development expense		9,000,000
Selling, General and Administrative Expense		55,000,000
Other Operating Income		0
Non-service pension cost (benefit)		(123,000,000)
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	0	0
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	93,000,000	93,000,000
Interest cost	279,000,000	278,000,000
Expected return on plan assets	563,000,000	540,000,000
Amortization of prior service credit	(10,000,000)	(9,000,000)
Recognized actuarial net loss (gain)	(101,000,000)	(143,000,000)
Net settlement and curtailment (gain) loss	1,000,000	(1,000,000)
Total net periodic benefit (income) cost	(101,000,000)	(34,000,000)
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	1,000,000	1,000,000
Interest cost	6,000,000	7,000,000
Expected return on plan assets	0	0
Amortization of prior service credit	(1,000,000)	0
Recognized actuarial net loss (gain)	2,000,000	3,000,000
Net settlement and curtailment (gain) loss	0	0
Total net periodic benefit (income) cost	$ 4,000,000	$ 5,000,000