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Supplemental Cash Flow Information (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Supplemental Cash Flow Information [Abstract]    
Interest (1) $ 54,558,000 $ 33,504,000
Income Taxes, Net of Refunds Received 54,440,000 83,955,000
Interest Costs Capitalized 10,000,000 12,000,000
Accrued Capital Expenditures $ 809,000,000 $ 880,000,000