Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and other asset-related charges	$ 12	$ 130	$ 36	$ 130
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets: [Abstract]
Deposits held in money market funds	18		18		$ 82
Foreign exchange contracts	0		0		0
Total assets	18		18		82
Liabilities: [Abstract]
Interest rate swap	0		0		0
Foreign exchange contracts	0		0		0
Total liabilities	0		0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets: [Abstract]
Deposits held in money market funds	0		0		0
Foreign exchange contracts	5		5		1
Total assets	5		5		1
Liabilities: [Abstract]
Interest rate swap	4		4		6
Foreign exchange contracts	1		1		5
Total liabilities	5		5		11
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets: [Abstract]
Deposits held in money market funds	0		0		0
Foreign exchange contracts	0		0		0
Total assets	0		0		0
Liabilities: [Abstract]
Interest rate swap	0		0		0
Foreign exchange contracts	0		0		0
Total liabilities	0		0		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets: [Abstract]
Deposits held in money market funds	18		18		82
Foreign exchange contracts	5		5		1
Total assets	23		23		83
Liabilities: [Abstract]
Interest rate swap	4		4		6
Foreign exchange contracts	1		1		5
Total liabilities	5		5		$ 11
Asset related charges [Member] | Other Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and other asset-related charges	$ 0	$ 3	$ 0	$ 3