Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Senior Debt [Line Items]
Carrying value of senior debt	$ 7,615	$ 6,433
Assets, Fair Value Disclosure [Abstract]
Investments	77	80
Interest rate swaps	3
Foreign exchange contracts	8	6
Total Assets	88	86
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation	314	307
Foreign exchange contracts	3	2
Total Liabilities	317	309
Senior Notes [Member]
Senior Debt [Line Items]
Fair value of senior debt	7,960	7,150
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Investments	77	80
Interest rate swaps	0
Foreign exchange contracts	0	0
Total Assets	77	80
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation	0	0
Foreign exchange contracts	0	0
Total Liabilities	0	0
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Investments	0	0
Interest rate swaps	3
Foreign exchange contracts	8	6
Total Assets	11	6
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation	314	307
Foreign exchange contracts	3	2
Total Liabilities	317	309
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Investments	0	0
Interest rate swaps	0
Foreign exchange contracts	0	0
Total Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation	0	0
Foreign exchange contracts	0	0
Total Liabilities	$ 0	$ 0