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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
The following table presents goodwill activity for the periods indicated (in millions):
 December 31,
2019		Goodwill
Acquired		 Adjustments December 31,
2020		Goodwill
Acquired		 Adjustments December 31,
2021
Goodwill$4,155 $— $130 $4,285 $22 $(129)$4,178 

The adjustments to goodwill during the years ended December 31, 2021 and 2020 were primarily due to foreign currency translation. There were no impairments to goodwill in 2021 and 2020.
 
Amortization expense for intangible assets was $9 million, $28 million and $35 million for the years ended December 31, 2021, 2020 and 2019, respectively. Intangible asset balances were immaterial as of December 31, 2021 and 2020.