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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Consolidated Balance Sheets (Unaudited)    
Allowances for doubtful accounts $ 614 $ 878
Common stock, par value $ 1 $ 1
Common stock, authorized 14,000,000,000 14,000,000,000
Common stock, issued 6,495,231,088 6,495,231,088
Treasury stock, held 690,487,327 568,719,202