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Investments, Loans and Long-Term Receivables - Summarized Financial Information for Equity Method Investments in Affiliated Companies (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule of Variable Interest Entities for Loans to Commercial Borrowers [Line Items]      
Revenues $ 77,263 $ 105,589 $ 128,881
Income before income taxes 11,958 11,250 12,121
Net income 11,089 9,495 9,145
Current assets 21,530 14,039 36,139
Noncurrent assets 76,300 79,411 126,163
Current liabilities 9,708 9,325 22,483
Noncurrent liabilities $ 22,993 $ 24,412 $ 30,960