Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ 622		$ 619	$ 1,185	$ 1,184
Cost of services, maintenance and rentals	854		872	1,722	1,753
Research, development and engineering expenses	101		102	201	213
Selling, administrative and general expenses	624		626	1,252	1,260
Restructuring and related costs	34		39	62	157
Other expenses, net	39		68	69	182
ASU 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Leases, Future Minimum Payments Due		$ 450
ASU 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Collections on Beneficial Interests Received in sales of Accounts Receivable and Finance Receivables			56		110
ASU 2016-18 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted Cash and Cash Equivalents	$ 64	75		$ 64
ASU 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales			619		1,184
Cost of services, maintenance and rentals			872		1,753
Research, development and engineering expenses			102		213
Selling, administrative and general expenses			626		1,260
Restructuring and related costs			39		157
Other expenses, net			68		182
ASU 2018-05 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax Act estimated non-cash provisional charge		$ 400
As Reported [Member] | ASU 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales			619		1,186
Cost of services, maintenance and rentals			884		1,784
Research, development and engineering expenses			106		224
Selling, administrative and general expenses			643		1,307
Restructuring and related costs			40		160
Other expenses, net			34		88
Adjustments for New Accounting Pronouncement [Member] | ASU 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales			0		(2)
Cost of services, maintenance and rentals			(12)		(31)
Research, development and engineering expenses			(4)		(11)
Selling, administrative and general expenses			(17)		(47)
Restructuring and related costs			(1)		(3)
Other expenses, net			$ 34		$ 94