v2.4.0.6
U.S. and International Components of Income before Income Taxes (Detail) (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
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]                      
U.S.                 $ 882 $ 658 $ 886
International                 (338) 276 611
Income before income taxes $ 273 [1] $ 130 [1] $ 225 [1] $ 307 [1] $ 337 [1] $ (22) [1] $ 146 [1] $ 84 [1] $ 544 $ 934 $ 1,497
[1] The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and changes in the number of weighted-average shares outstanding for each period.