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Intangible Assets
12 Months Ended
Dec. 31, 2021
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]  
Intangible Assets Intangible Assets
Intangible assets as of December 31, 2021, consist of the following (in millions):
 CostAccumulated
Amortization
Net
Customer relationships$18,410 $(7,141)$11,269 
Trademarks and other509 (239)270 
Total Intangible assets, net$18,919 $(7,380)$11,539 

Intangible assets as of December 31, 2020, consist of the following (in millions):
 CostAccumulated
Amortization
Net
Customer relationships$18,586 $(5,024)$13,562 
Trademarks and other555 (189)366 
Total Intangible assets, net$19,141 $(5,213)$13,928 

Amortization expense for intangible assets with finite lives was $2,383 million, $2,400 million and $1,444 million for the years ended December 31, 2021, 2020 and 2019, respectively.

Estimated amortization of intangible assets for the next five years is as follows (in millions):
2022$2,232 
20232,042 
20241,843 
20251,675 
20261,214