Financial Instruments and Fair Value Measurements (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Carrying value of senior debt	$ 5,862,000,000	$ 5,863,000,000
Fair value of senior debt	7,100,000,000	7,160,000,000
Assets:
Investments	73,000,000	70,000,000
Foreign currency hedges	2,000,000
Total Assets	75,000,000	70,000,000
Liabilities:
Deferred compensation	213,000,000	201,000,000
Foreign currency hedges	1,000,000	2,000,000
Total Liabilities	214,000,000	203,000,000
Level 1 [Member]
Assets:
Investments	73,000,000	70,000,000
Foreign currency hedges	0
Total Assets	73,000,000	70,000,000
Liabilities:
Deferred compensation	0	0
Foreign currency hedges	0	0
Total Liabilities	0	0
Level 2 [Member]
Assets:
Investments	0	0
Foreign currency hedges	2,000,000
Total Assets	2,000,000	0
Liabilities:
Deferred compensation	213,000,000	201,000,000
Foreign currency hedges	1,000,000	2,000,000
Total Liabilities	214,000,000	203,000,000
Level 3 [Member]
Assets:
Investments	0	0
Foreign currency hedges	0
Total Assets	0	0
Liabilities:
Deferred compensation	0	0
Foreign currency hedges	0	0
Total Liabilities	$ 0	$ 0