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EPS under Basic and Diluted Computations (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share Disclosure [Line Items]    
Net income $ 206 $ 195
Preferred stock dividends 8  
Net income available to common stockholders $ 198 $ 195
Weighted-average common shares outstanding - basic 1,279 1,272
Common stock equivalent shares related to stock incentive plans 3 1
Weighted-average common shares outstanding - diluted 1,282 [1] 1,273 [1]
Basic EPS $ 0.15 $ 0.15
Diluted EPS $ 0.15 $ 0.15
[1] (1) Antidilutive stock options and restricted stock awards excluded from the calculation of diluted EPS totaled 45 million and 60 million shares for the first quarters of 2013 and 2012, respectively.