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Intangible Assets
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Identifiable intangible assets consisted of the following:
(In millions)Gross
Carrying
Amount		Accumulated
Amortization		Net Book
Value
March 31, 2021
Customer relationships$15,256 $4,085 $11,171 
Acquired software and technology2,617 953 1,664 
Trade names629 189 440 
Purchased software971 244 727 
Capitalized software and other intangibles1,439 446 993 
Total$20,912 $5,917 $14,995 
(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 
Amortization expense associated with the above identifiable intangible assets was as follows:
Three Months Ended
March 31,
(In millions)20212020
Amortization expense$642 $647 

Amortization expense during the three months ended March 31, 2020 includes $10 million of accelerated amortization associated with the termination of certain vendor contracts (see Note 14).