Quarterly report pursuant to Section 13 or 15(d)

Activity Related to Noncontrolling Interests (Detail)

v2.3.0.15
Activity Related to Noncontrolling Interests (Detail) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2011
Noncontrolling Interests
Sep. 30, 2010
Noncontrolling Interests
Noncontrolling Interest [Line Items]        
Balance at beginning of period $ 7,798 $ 7,979 $ 68 $ 66
Acquired noncontrolling interests     3  
Dividends attributable to noncontrolling interests        
Net income attributable to noncontrolling interests        
Balance at end of period $ 7,798 $ 7,979 $ 71 $ 66