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Common and Preferred Shares and Warrants (Details)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Authorized shares and a reconciliation of common shares issued and outstanding      
Common shares, authorized 3,600,000,000 3,600,000,000 3,600,000,000
Shares issued and outstanding at beginning of period 1,197,000,000 1,192,000,000 1,160,000,000
(Repurchases) Issuance of common shares (48,000,000) (14,000,000) 22,000,000
Other, primarily stock option exercises and RSAs granted 15,000,000 19,000,000 10,000,000
Shares issued and outstanding as of December 31 1,164,000,000 1,197,000,000 1,192,000,000
Shares reserved for issuance under employee stock and employee benefit plans 90,000,000