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Intangible Assets
 9 Months Ended
Sep. 30, 2020
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
September 30, 2020
Customer relationships$15,124 $3,217 $11,907 
Acquired software and technology2,555 802 1,753 
Trade names616 154 462 
Capitalized software and other intangibles1,236 400 836 
Purchased software930 239 691 
Total$20,461 $4,812 $15,649 
(In millions)Gross
Carrying
Amount		Accumulated
Amortization		Net Book
Value
December 31, 2019
Customer relationships$16,187 $2,145 $14,042 
Acquired software and technology2,607 639 1,968 
Trade names620 105 515 
Capitalized software and other intangibles942 332 610 
Purchased software680 173 507 
Total$21,036 $3,394 $17,642 
Amortization expense associated with the above identifiable intangible assets was as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2020201920202019
Amortization expense$623 $459 $1,934 $650 

Amortization expense during the three and nine months ended September 30, 2020 includes $18 million and $53 million, respectively, of accelerated amortization associated with the termination of certain vendor contracts (see Note 16).

The Company estimates that annual amortization expense with respect to intangible assets recorded at September 30, 2020 will be as follows:
(In millions)
Year ending December 31,
Remainder of 2020$621 
20212,432 
20222,244 
20231,979 
20241,531 
Thereafter6,842 
   Total$15,649