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4. SUPPLEMENTAL CASH FLOW INFORMATION (Detail) - Supplemental Cash Flow Information (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Interest $ 319,432 $ 486,546
Federal, state and local income taxes,    
net of refunds 273,766 1,105,055
Fixed asset purchases in accounts payable $ 207,731 $ 527,853