Restructuring Programs (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Employees	Jun. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
restructuring reserves expected to be spent in next twelve months	$ 38		$ 38
Restructuring Charges			$ 49
Restructuring and Related Cost, Number of Positions Eliminated | Employees			2,500
Professional and Contract Services Expense			$ 8
Restructuring Reserve [Roll Forward]
Balance at beginning of period			21
Restructuring Charges			49
Reversals of prior accruals			(3)
Net Current Period Charges	34	$ 20	46	$ 45
Charges against reserve and currency			(25)
Balance at end of period	42		42
Reconciliation To Consolidated Statements Of Cash Flows [Abstract]
restructuring cash payments charged against the reserve	16	15	25	22
Asset Impairment Charges	(3)	(2)	(3)	(2)
Restructuring Cash Payments	13	13	22	20
Commercial Industries [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	22	15	31	36
Restructuring Reserve [Roll Forward]
Restructuring Charges	22	15	31	36
Public Sector [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	11	4	14	5
Restructuring Reserve [Roll Forward]
Restructuring Charges	11	4	14	5
Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1	1	1	4
Restructuring Reserve [Roll Forward]
Restructuring Charges	1	$ 1	1	$ 4
Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			31
Restructuring Reserve [Roll Forward]
Balance at beginning of period			15
Restructuring Charges			31
Reversals of prior accruals			(2)
Net Current Period Charges			29
Charges against reserve and currency			(19)
Balance at end of period	25		25
Lease Cancellation and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			16
Restructuring Reserve [Roll Forward]
Balance at beginning of period			5
Restructuring Charges			16
Reversals of prior accruals			(1)
Net Current Period Charges			15
Charges against reserve and currency			(3)
Balance at end of period	17		17
Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			2
Restructuring Reserve [Roll Forward]
Balance at beginning of period			1
Restructuring Charges			2
Reversals of prior accruals			0
Net Current Period Charges			2
Charges against reserve and currency			(3)
Balance at end of period	$ 0		$ 0