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Goodwill and Other Intangible Assets - Amortizable Intangible Assets (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2017 $ 1,560
2018 1,452
2019 1,044
2020 600
2021 473
Total amortization expense over next five years $ 5,129