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Intangible Assets Including Goodwill - Future Amortization (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Future amortization expense, by year  
2017 (for Q4) $ 359
2018 1,252
2019 873
2020 607
2021 446
Capitalized software  
Future amortization expense, by year  
2017 (for Q4) 144
2018 441
2019 202
2020 48
Acquired Intangibles  
Future amortization expense, by year  
2017 (for Q4) 216
2018 811
2019 671
2020 559
2021 $ 446