Restructuring Programs (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) Employees	Mar. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated (approximately) | Employees	700
Professional and Contract Services Expense	$ 6
Restructuring Reserve [Roll Forward]
Balance at beginning of period	21
Restructuring provision	14
Reversals of prior accruals	(2)
Net Current Period Charges	12	$ 25
Restructuring, Charges Against Reserve and Currency	9	7
Balance at end of period	24
Reconciliation To Consolidated Statements Of Cash Flows [Abstract]
Restructuring Cash Payments	9	7
Commercial Industries [Member]
Restructuring Reserve [Roll Forward]
Net Current Period Charges	8	21
Public Sector [Member]
Restructuring Reserve [Roll Forward]
Net Current Period Charges	3	1
Other [Member]
Restructuring Reserve [Roll Forward]
Net Current Period Charges	1	$ 3
Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period	15
Restructuring provision	11
Reversals of prior accruals	(1)
Net Current Period Charges	10
Restructuring, Charges Against Reserve and Currency	8
Balance at end of period	17
Lease Cancellation and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period	5
Restructuring provision	3
Reversals of prior accruals	(1)
Net Current Period Charges	2
Restructuring, Charges Against Reserve and Currency	1
Balance at end of period	6
Asset Impairments [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period	1
Restructuring provision	0
Reversals of prior accruals	0
Net Current Period Charges	0
Restructuring, Charges Against Reserve and Currency	0
Balance at end of period	$ 1