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EPS under Basic and Diluted Computations (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share Disclosure [Line Items]        
Net income $ 247 $ 220 $ 717 $ 701
Preferred stock dividends (9)   (23)  
Net income available to common stockholders $ 238 [1] $ 220 [1] $ 694 [1] $ 701 [1]
Weighted-average common shares outstanding - basic 1,274 1,228 1,273 1,213
Common stock equivalent shares related to stock incentive plans 1 1 1 3
Weighted-average common shares outstanding - diluted 1,275 [2] 1,229 [2] 1,274 [2] 1,216 [2]
Basic EPS $ 0.19 $ 0.18 $ 0.54 $ 0.58
Diluted EPS $ 0.19 $ 0.18 $ 0.54 $ 0.57
[1] Net income available to participating securities (unvested restricted shares) was not material for the third quarters or first nine months of 2012 or 2011.
[2] Antidilutive stock options and restricted stock awards excluded from the calculation of diluted EPS totaled 59 million and 50 million shares for the third quarters of 2012 and 2011, respectively, and 61 million and 48 million shares for the first nine months of 2012 and 2011, respectively.