Fair Value of Assets and Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member]
Assets: [Abstract]
Deposits held in money market funds	$ 32	$ 82
Foreign exchange contracts	0	0
Total assets	32	82
Liabilities: [Abstract]
Interest rate swap	0	0
Foreign exchange contracts	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Assets: [Abstract]
Deposits held in money market funds	0	0
Foreign exchange contracts	5	1
Total assets	5	1
Liabilities: [Abstract]
Interest rate swap	5	6
Foreign exchange contracts	1	5
Total liabilities	6	11
Fair Value, Inputs, Level 3 [Member]
Assets: [Abstract]
Deposits held in money market funds	0	0
Foreign exchange contracts	0	0
Total assets	0	0
Liabilities: [Abstract]
Interest rate swap	0	0
Foreign exchange contracts	0	0
Total liabilities	0	0
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets: [Abstract]
Deposits held in money market funds	32	82
Foreign exchange contracts	5	1
Total assets	37	83
Liabilities: [Abstract]
Interest rate swap	5	6
Foreign exchange contracts	1	5
Total liabilities	$ 6	$ 11