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Goodwill and Other Intangible Assets Intangible Assets Amortization Expense (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Intangible Assets Future Amortization Expense [Abstract]  
2015 $ 401
2016 394
2017 384
2018 364
2019 357
2020 $ 352