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Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets by class
Identifiable intangible assets consisted of the following:
(In millions)Gross
Carrying
Amount		Accumulated
Amortization		Net Book
Value
June 30, 2021
Customer relationships$15,373 $4,528 $10,845 
Acquired software and technology2,673 1,037 1,636 
Trade names622 205 417 
Purchased software1,069 394 675 
Capitalized software and other intangibles1,628 490 1,138 
Total$21,365 $6,654 $14,711 
(In millions)Gross
Carrying
Amount		Accumulated
Amortization		Net Book
Value
December 31, 2020
Customer relationships$15,271 $3,668 $11,603 
Acquired software and technology2,562 879 1,683 
Trade names618 172 446 
Purchased software913 207 706 
Capitalized software and other intangibles1,332 412 920 
Total$20,696 $5,338 $15,358 
Schedule of amortization expense of intangible assets
Amortization expense associated with the above identifiable intangible assets was as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
(In millions)2021202020212020
Amortization expense$653 $664 $1,295 $1,311