Changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2019 were as follows (in millions):



	Google			Other Bets			Total Consolidated
Balance as of December 31, 2017	$	16,295		$	452		$	16,747
Acquisitions	1,227			0			1,227
Transfers	80			(80		)	0
Foreign currency translation and other adjustments	(81		)	(5		)	(86		)
Balance as of December 31, 2018	17,521			367			17,888
Acquisitions	2,353			475			2,828
Transfers	9			(9		)	0
Foreign currency translation and other adjustments	38			(130		)	(92		)
Balance as of December 31, 2019	$	19,921		$	703		$	20,624



	As of December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Patents and developed technology	$	5,125	$	3,394	$	1,731
Customer relationships	349		308		41
Trade names and other	703		255		448
Total	$	6,177	$	3,957	$	2,220



	As of December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Value
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

Patents and developed technology, customer relationships, and trade names and other have weighted-average remaining useful lives of 2.3 years, 5.6 years, and 3.0 years, respectively.

Amortization expense relating to purchased intangible assets was $796 million, $865 million, and $795 million for the years ended December 31, 2017, 2018, and 2019, respectively.

As of December 31, 2019, expected amortization expense relating to purchased intangible assets for each of the next five years and thereafter is as follows (in millions):