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Goodwill and Intangible Assets (Schedules for Amortization Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Finite Lived Intangible Asset        
Amortization expense for acquired intangible assets $ 61 $ 51 $ 188 $ 162
Expected amortization expense for acquired intangible assets recorded as of balance sheet date        
Remainder of 2018 62   62  
2019 241   241  
2020 229   229  
2021 220   220  
2022 206   206  
2023 175   175  
After 2023 $ 950   $ 950