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Capital Stock - Net Income Per Common Share (Detail) (USD $)
In Millions, except Per Share data, 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
Earnings Per Share [Line Items]                      
Income attributable to common stock $ 649 $ 161 $ 337 $ 778 $ 1,170 $ 983 $ 1,240 $ 1,115 $ 1,925 $ 4,508 $ 3,000
Mandatory Convertible Preferred Stock                   76 32
Income attributable to common stock, including assumed conversions                 $ 1,925 $ 4,584 $ 3,032
Income attributable to common stock, shares                 389 384 352
Mandatory Convertible Preferred Stock                   14 5
Stock options and other                 2 2 2
Income attributable to common stock, including assumed conversions, shares                 391 400 359
Income attributable to common stock, per share $ 1.66 $ 0.41 $ 0.87 $ 2.02 $ 3.05 $ 2.56 $ 3.23 $ 2.91 $ 4.95 $ 11.75 $ 8.53
Income attributable to common stock, including assumed conversions, per share $ 1.64 $ 0.41 $ 0.86 $ 2.00 $ 2.98 $ 2.50 $ 3.17 $ 2.86 $ 4.92 $ 11.47 $ 8.46