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Goodwill and Other Intangibles - Intangible Amortization Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]      
Intangible amortization expense $ 843 $ 877 $ 924