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Goodwill and Other Intangible Assets - Amortizable Intangible Assets (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2017 $ 489
2018 1,555
2019 1,143
2020 662
2021 482
Total amortization expense over next five years $ 4,331