Debt and Financing Costs (Details Textual) (USD $)	1 Months Ended			6 Months Ended		1 Months Ended												6 Months Ended
	Jun. 04, 2017	Aug. 12, 2016	May 31, 2013	Jun. 30, 2012	Dec. 31, 2011	Apr. 30, 2012 Maturing on 2012 [Member]	Jun. 30, 2012 Maturing on 2012 [Member]	Jun. 30, 2012 Maturing 2017 [Member]	Jun. 30, 2012 Maturing 2022 [Member]	Jun. 30, 2012 Maturing 2043 [Member]	Jun. 30, 2012 Maturity 2013 [Member]	Jun. 30, 2012 Unsecured Committed Bank Credit Facilities [Member]	Jun. 30, 2012 Unsecured Committed Bank Credit Facilities in U.S. [Member]	Jun. 30, 2012 Unsecured Committed Bank Credit Facilities in Australia [Member]	Jun. 30, 2012 Unsecured Committed Bank Credit Facilities in Canada [Member]	Jun. 30, 2012 Argentina overdraft lines of credit [Member]	Dec. 31, 2011 Argentina overdraft lines of credit [Member]	Jun. 30, 2012 Five Year Facility [Member]	Jun. 30, 2012 Commercial paper program maximum amount [Member]
Short-term Debt [Line Items]
Commercial paper program, current																			$ 3,000,000,000
Line of Credit Facility [Line Items]
New unsecured committed revolving banking facility																		1,000,000,000
Revolving bank facility												1,000,000,000	1,700,000,000	300,000,000	300,000,000
Company issued principal amount of senior unsecured notes								400,000,000	1,100,000,000	1,500,000,000
Principal amount of senior unsecured, percentage							6.25%	1.75%	3.25%	4.75%	5.25%
Current debt				568,000,000	431,000,000						500,000,000					68,000,000	31,000,000
Repayment of current debt						400,000,000
Debt And Financing Costs (Textual) [Abstract]
Maturing date of credit facilities	Jun. 04, 2017	Aug. 12, 2016	May 31, 2013
Commercial paper program, previous				2,950,000,000
Outstanding commercial paper				$ 393,000,000	$ 0
Line of Credit Facility, Interest Rate Description				On June 4, 2012, the Company entered into a new Global Credit Facility consisting of a $1.7 billion revolving syndicated bank credit facility for the U.S., a $300 million revolving syndicated bank credit facility for Australia and a $300 million revolving syndicated bank credit facility for Canada, which replaced the Company's existing syndicated bank credit facilities that were scheduled to mature in May 2013. The new facilities are scheduled to mature on June 4, 2017. There were no changes to the Company's $1.0 billion U.S. credit facility that matures on August 12, 2016