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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets by class Identifiable intangible assets consisted of the following at December 31:
(In millions)Gross
Carrying
Amount		Accumulated
Amortization		Net Book
Value
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 
(In millions)Gross
Carrying
Amount		Accumulated
Amortization		Net Book
Value
2019
Customer relationships$16,187 $2,145 $14,042 
Acquired software and technology2,607 639 1,968 
Trade names620 105 515 
Purchased software680 173 507 
Capitalized software and other intangibles942 332 610 
Total$21,036 $3,394 $17,642 
Schedule of amortization expense of intangible assets Amortization expense associated with the above identifiable intangible assets was as follows for the years ended December 31:
(In millions)202020192018
Amortization expense$2,563 $1,299 $347 
Schedule of estimated annual amortization expense of intangible assets The Company estimates that annual amortization expense with respect to intangible assets recorded at December 31, 2020 will be as follows:
(In millions)
Year Ending December 31,
2021$2,451 
20222,262 
20232,010 
20241,616 
20251,342 
Thereafter5,677 
Total$15,358