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Segment Information (Details 2) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Total Assets [Line Items]
Total assets	$ 40,360,438,000	$ 31,633,973,000
US Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	24,924,363,000	17,965,559,000	17,301,434,000
Canada Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	3,764,002,000	3,347,771,000	3,341,062,000
Europe And South Africa Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	2,235,199,000	1,846,751,000	1,513,323,000
Asia Pacific Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	3,208,732,000	2,902,101,000	2,369,435,000
Corporate And Other Segment Reporting Information [Member]
Segment Total Assets [Line Items]
Total assets	$ 6,228,142,000	$ 5,571,791,000	$ 4,144,926,000

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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