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Goodwill and Other Intangible Assets - Estimated Aggregate Pre-Tax Amortization Expense Related to Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense remainder of 2013 $ 22
Amortization expense 2014 50
Amortization expense 2015 22
Amortization expense 2016 20
Amortization expense 2017 $ 17