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Common and Preferred Shares and Warrants (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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 year 1,164,000,000 1,197,000,000 1,192,000,000
Repurchases of common shares (69,000,000) (48,000,000) (14,000,000)
Other, primarily stock option exercises and RSAs granted 10,000,000 15,000,000 19,000,000
Shares issued and outstanding as of December 31 1,105,000,000 1,164,000,000 1,197,000,000
Stockholders' Equity Note (Textuals) [Abstract]      
Shares reserved for issuance under employee stock and employee benefit plans 80,000,000