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Other Assets - Estimated Future Amortization for Existing Identifiable Intangible Assets Through 2021 (Detail)
$ in Millions
Sep. 30, 2016
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
Remainder of 2016 $ 35
Future amortization, 2017 126
Future amortization, 2018 107
Future amortization, 2019 76
Future amortization, 2020 25
Future amortization, 2021 $ 18