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Other Assets (Details 3)
$ in Millions
Dec. 31, 2016
USD ($)
Estimated amortization expense for other intangible assets  
Estimated amortization expense, 2017 $ 189
Estimated amortization expense, 2018 175
Estimated amortization expense, 2019 146
Estimated amortization expense, 2020 121
Estimated amortization expense, 2021 $ 93