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Shareholders' Equity and Comprehensive Earnings (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 1 Months Ended
Feb. 03, 2012
May 31, 2012
Feb. 29, 2012
Jan. 31, 2012
Nov. 30, 2011
Oct. 31, 2011
Nov. 02, 2011
Share repurchase agreement              
Accelerated share repurchase agreement amount     $ 200     $ 100  
Weighted average price per share for the contract period   $ 40.66   $ 34.66      
Advance payment under agreement $ 200           $ 100
Shares received (in shares) 4,584,819 334,039   361,615 2,523,836    
Percentage of treasury stock acquired of total stock 90.00%           90.00%