Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets Other Intangibles (Details)

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Goodwill and Other Intangible Assets Other Intangibles (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 23 $ 32 $ 48
Future Amortization Expense, Year One 20    
Future Amortization Expense, Year Two 15    
Future Amortization Expense, Year Three 12    
Future Amortization Expense, Year Four 10    
Future Amortization Expense, Year Five $ 10