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Intangible Assets Including Goodwill - Future Amortization (Details)
$ in Millions
Mar. 31, 2018
USD ($)
Future amortization expense, by year  
2018 (for Q2-Q4) $ 986
2019 964
2020 675
2021 454
2022 377
Capitalized software  
Future amortization expense, by year  
2018 (for Q2-Q4) 378
2019 292
2020 115
2021 8
Acquired intangibles  
Future amortization expense, by year  
2018 (for Q2-Q4) 607
2019 672
2020 560
2021 446
2022 $ 377