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Stock Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available to be granted 47,221,911    
Total intrinsic value of options exercised   $ 37 $ 110
Vesting period, in years 3 years    
Weighted-average grant date fair value, per share $ 28.77    
2010 Plan [Member] | Common Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares issuable under the stock compensation plan 50,000,000    
Shares available to be granted 46,574,327    
Directors Plan [Member] | Common Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares issuable under the stock compensation plan 1,000,000    
Shares available to be granted 592,681    
Restricted And Deferred Stock Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pre-tax compensation expense 46 47 44
Deferred tax benefit 18 18 16
Unamortized compensation expense 63    
Weighted-average period of recognition, in years 2 years    
Weighted-average grant date fair value 53 54 53
Weighted-average grant date fair value, per share $ 28.77 $ 24.34 $ 19.90
Total fair value, stock vested $ 81 $ 56 $ 33