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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets GOODWILL AND INTANGIBLE ASSETS
GOODWILL
The following table presents goodwill balances and adjustments to those balances during the three months ended March 31, 2021:
December 31,
2020		Goodwill
Acquired		 Adjustments March 31,
2021
 (In millions)
Total goodwill$9,135 $— $(18)$9,117 

The adjustments to goodwill during the three months ended March 31, 2021 pertain to foreign currency translation adjustments.
INTANGIBLE ASSETS
The components of identifiable intangible assets are as follows:
 March 31, 2021December 31, 2020
 
Gross Carrying Amount  
Accumulated Amortization 
Net Carrying AmountWeighted Average Useful Life (Years)
Gross Carrying Amount
Accumulated Amortization 
Net Carrying AmountWeighted Average Useful Life (Years)
 (In millions, except years)
Intangible assets:        
Customer lists and user base$1,201 $(822)$379 6$1,206 $(797)$409 6
Marketing related321 (289)32 3321 (278)43 3
Developed technology999 (638)361 3999 (577)422 3
All other448 (282)166 7449 (275)174 7
Intangible assets, net$2,969 $(2,031)$938 $2,975 $(1,927)$1,048  
        
Amortization expense for intangible assets was $106 million and $114 million for the three months ended March 31, 2021 and 2020, respectively.

Expected future intangible asset amortization as of March 31, 2021 was as follows (in millions):
Fiscal years:
Remaining 2021$294 
2022337 
202399 
202498 
202582 
Thereafter28 
Total$938