Financial Instruments and Fair Value Measurements (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Fair Value Disclosures [Abstract]
Carrying value of senior debt	$ 5,871,000,000	$ 5,925,000,000
Fair value of senior debt	6,880,000,000	6,860,000,000
Assets:
Investments	70,000,000	61,000,000
Foreign currency hedges	2,000,000	4,000,000
Total Assets	72,000,000	65,000,000
Liabilities:
Deferred compensation	183,000,000	173,000,000
Foreign currency hedges	1,000,000
Total Liabilities	184,000,000	173,000,000
Level 1 [Member]
Assets:
Investments	70,000,000	61,000,000
Foreign currency hedges	0	0
Total Assets	70,000,000	61,000,000
Liabilities:
Deferred compensation	0	0
Foreign currency hedges	0
Total Liabilities	0	0
Level 2 [Member]
Assets:
Investments	0	0
Foreign currency hedges	2,000,000	4,000,000
Total Assets	2,000,000	4,000,000
Liabilities:
Deferred compensation	183,000,000	173,000,000
Foreign currency hedges	1,000,000
Total Liabilities	184,000,000	173,000,000
Level 3 [Member]
Assets:
Investments	0	0
Foreign currency hedges	0	0
Total Assets	0	0
Liabilities:
Deferred compensation	0	0
Foreign currency hedges	0
Total Liabilities	$ 0	$ 0