Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

Goodwill

Changes in the carrying amount of goodwill for the years ended December 31, 2019 and 2020 were as follows (in millions):

	Google		Google Services		Google Cloud		Other Bets		Total
Balance as of December 31, 2018	$	17,521	$	0	$	0	$	367	$	17,888
Acquisitions	2,353		0		0		475		2,828
Transfers	9		0		0		(9)		0
Foreign currency translation and other adjustments	38		0		0		(130)		(92)
Balance as of December 31, 2019	19,921		0		0		703		20,624
Acquisitions	204		0		0		0		204
Foreign currency translation and other adjustments	46		0		0		(4)		42
Allocation in the fourth quarter of 2020(1)	(20,171)		18,408		1,763		0		0
Acquisitions	0		53		189		0		242
Foreign currency translation and other adjustments	0		56		5		2		63
Balance as of December 31, 2020	$	0	$	18,517	$	1,957	$	701	$	21,175

(1)Represents reallocation of goodwill as a result of our change in segments in the fourth quarter of 2020. See Note 15 for further details

Other Intangible Assets

Information regarding purchased intangible assets were as follows (in millions):

	As of December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Patents and developed technology	$	4,972	$	3,570	$	1,402
Customer relationships	254		30		224
Trade names and other	703		350		353
Total	$	5,929	$	3,950	$	1,979

	As of December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Value
Patents and developed technology	$	4,639	$	3,649	$	990
Customer relationships	266		49		217
Trade names and other	699		461		238
Total	$	5,604	$	4,159	$	1,445

Patents and developed technology, customer relationships, and trade names and other have weighted-average remaining useful lives of 1.6 years, 4.9 years, and 2.1 years, respectively.

Amortization expense relating to purchased intangible assets was $865 million, $795 million, and $774 million for the years ended December 31, 2018, 2019, and 2020, respectively.

As of December 31, 2020, expected amortization expense relating to purchased intangible assets for each of the next five years and thereafter is as follows (in millions): 

2021	$	719
2022	375
2023	104
2024	78
2025	53
Thereafter	116
	$	1,445