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Intangible Assets Including Goodwill - Future Amortization (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Future amortization expense, by year  
2017 (for Q2 - Q4) $ 1,098
2018 1,158
2019 768
2020 557
2021 437
Capitalized software  
Future amortization expense, by year  
2017 (for Q2 - Q4) 391
2018 347
2019 119
2020 8
Acquired Intangibles  
Future amortization expense, by year  
2017 (for Q2 - Q4) 707
2018 811
2019 648
2020 549
2021 $ 437