v2.4.0.6
Redeemable Noncontrolling Interests and Total Equity (Redeemable Noncontrolling Interests) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Redeemable Noncontrolling Interest                      
Beginning balance       $ 0         $ 0    
Net income applicable to redeemable noncontrolling interests (116) (8) 0 0 0 0 0 0 (124) 0 0
Ending balance 4,309       0       4,309 0  
Wealth Management JV
                      
Redeemable Noncontrolling Interest                      
Beginning balance       0         0    
Reclass from nonredeemable noncontrolling interests                 4,288    
Net income applicable to redeemable noncontrolling interests                 124    
Foreign currency translation adjustments                 (2)    
Distributions                 (97) (346) (306)
Other                 (4)    
Ending balance $ 4,309       $ 0       $ 4,309 $ 0