Financial Instruments and Fair Value Measurements (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Senior Debt [Line Items]
Carrying value of senior debt	$ 8,851,000,000	$ 8,850,000,000
Assets, Fair Value Disclosure [Abstract]
Foreign currency hedges, assets	23,000,000	34,000,000
Total Assets	23,000,000	34,000,000
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation	358,000,000	347,000,000
Foreign currency hedges, liabilities	4,000,000	1,000,000
Total Liabilities	362,000,000	348,000,000
Senior Debt [Member]
Senior Debt [Line Items]
Fair value of senior debt	9,520,000,000	9,510,000,000
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign currency hedges, assets	0	0
Total Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation	0	0
Foreign currency hedges, liabilities	0	0
Total Liabilities	0	0
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign currency hedges, assets	23,000,000	34,000,000
Total Assets	23,000,000	34,000,000
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation	358,000,000	347,000,000
Foreign currency hedges, liabilities	4,000,000	1,000,000
Total Liabilities	362,000,000	348,000,000
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign currency hedges, assets	0	0
Total Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation	0	0
Foreign currency hedges, liabilities	0	0
Total Liabilities	$ 0	$ 0