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Goodwill and Other Intangible Assets
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
The changes in the net carrying amount of goodwill for the six months ended June 30, 2020 are as follows (in millions):
Balance as of December 31, 2019$8,165  
Goodwill related to current year acquisitions315  
Goodwill related to disposals(3) 
Foreign currency translation(121) 
Balance as of June 30, 2020$8,356  
Other intangible assets by asset class are as follows (in millions):
 June 30, 2020December 31, 2019
 Gross Carrying AmountAccumulated
Amortization and Impairment		Net Carrying AmountGross Carrying AmountAccumulated
Amortization and Impairment		Net Carrying Amount
Customer-related and contract-based$2,246  $1,635  $611  $2,264  $1,600  $664  
Tradenames (1)
18  15  3  1,029  956  73  
Technology and other416  331  85  380  334  46  
Total$2,680  $1,981  $699  $3,673  $2,890  $783  
(1)In the second quarter of 2020, Aon wrote off $1.0 billion of fully amortized tradenames, including the Hewitt and Benfield tradenames. The company no longer expects to receive economic benefits from these tradenames.
The estimated future amortization for finite-lived intangible assets as of June 30, 2020 is as follows (in millions):
Remainder of 2020$83  
2021138  
202298  
202387  
202470  
202552  
Thereafter171  
Total$699