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Goodwill and Other Intangible Assets - Estimated Aggregate Pre-tax Amortization Expense Related to Intangible Assets (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense 2016 $ 8
Amortization expense 2017 5
Amortization expense 2018 2
Amortization expense 2019 1
Amortization expense 2020 $ 1