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Earnings Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Shareholders' net income $ 528 $ 57
Shares:    
Weighted average 269,979,000 283,804,000
Common stock equivalents 4,488,000 5,454,000
Total shares 274,467,000 289,258,000
EPS, basic $ 1.96 $ 0.20
EPS, effect of dilution $ (0.04) $ 0
EPS, diluted $ 1.92 $ 0.20
Antidilutive Options [Abstract]    
Antidilutive options 0 0
Common shares held in Treasury 97,428,469 80,302,892