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Goodwill And Other Intangible Assets (Estimate Future Amortization Expense) (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Expected amortization expense    
2017 $ 58  
2018 49  
2019 49  
2020 49  
2021 49  
Thereafter 89  
Net Carrying Amount $ 343 $ 404