The Company has approximately $1.6 billion of goodwill and $450 million of identified intangible assets at December 31, 2023.

Goodwill is identified by segment as follows (in millions):


	Wellbore Technologies			Completion & Production Solutions		Rig Technologies		Total

Balance at December 31, 2021		342			473		712		1,527
Goodwill acquired during period		3			7		—		10
Adjustment during the measurement period of assets acquired		(32	)		—		—		(32	)
Balance at December 31, 2022	$	313		$	480	$	712	$	1,505
Goodwill acquired during period		—			—		40		40
Adjustment during the measurement period of assets acquired		14			3		—		17
Balance at December 31, 2023 (1)	$	327		$	483	$	752	$	1,562

(1)

Accumulated goodwill impairment was $7,261 million as of December 31, 2023.

Identified intangible assets with determinable lives consist primarily of customer relationships, trademarks, trade names, patents, and technical drawings acquired in acquisitions, and are being amortized in a manner consistent with the underlying cash flows over the estimated useful lives of 2-40 years. Amortization expense of identified intangibles is expected to be approximately $39 million, $36 million, $34 million, $31 million, and $25 million for the next five years.

The net book values of identified intangible assets are identified by segment as follows (in millions):


	Wellbore Technologies			Completion & Production Solutions			Rig Technologies			Total
Balance at December 31, 2021	$	264		$	42		$	197		$	503
Additions to intangible assets		3			—			—			3
Adjustment during the measurement period of assets acquired		32			—			—			32
Amortization		(17	)		(5	)		(29	)		(51	)
Currency translation adjustments		—			—			3			3
Balance at December 31, 2022	$	282		$	37		$	171		$	490
Additions to intangible assets		2			—			—			2
Amortization		(17	)		(5	)		(21	)		(43	)
Currency translation adjustments		—			—			1			1
Balance at December 31, 2023	$	267		$	32		$	151		$	450

Identified intangible assets by major classification consist of the following (in millions):


	Gross		Accumulated Amortization			Net Book Value
December 31, 2022:
Customer relationships	$	499	$	(351	)	$	148
Trademarks		173		(127	)		46
Patents		128		(66	)		62
Indefinite-lived trade names		196		—			196
Other		104		(66	)		38
Total identified intangibles	$	1,100	$	(610	)	$	490
December 31, 2023:
Customer relationships	$	494	$	(369	)	$	125
Trademarks		174		(133	)		41
Patents		129		(75	)		54
Indefinite-lived trade names		196		—			196
Other		105		(71	)		34
Total identified intangibles	$	1,098	$	(648	)	$	450

Goodwill represents the excess of cost over the fair value of net assets acquired. Goodwill and intangibles with indefinite lives are not amortized. Goodwill is assigned to the reporting units that are expected to benefit from the synergies of a business combination. The recoverability of goodwill and indefinite-lived intangibles is assessed annually, or more frequently as needed when events or changes have occurred that would suggest an impairment of carrying value, by determining whether the fair values of the applicable reporting units exceed their carrying values.

The impairment analysis compares the reporting unit’s carrying value to the respective fair value. Fair value of the reporting unit is determined using significant unobservable inputs, or level 3 in the fair value hierarchy. These inputs are based on internal management estimates, forecasts and judgments, using discounted cash flow.

The discounted cash flow is based on management’s forecast of operating performance for the reporting unit. The two main assumptions used in measuring goodwill impairment, which bear the risk of change and could impact the Company’s goodwill impairment analysis, include the cash flow from operations from each reporting unit and its weighted average cost of capital. The starting point for each of the reporting unit’s cash flow from operations is the detailed annual plan or updated forecast. Cash flows beyond the updated forecasted operating plans are estimated using a terminal value calculation, which incorporates historical and forecasted financial cyclical trends for each reporting unit and considered long-term earnings growth rates. The financial and credit market volatility directly impacts our fair value measurement through our weighted average cost of capital that we use to determine our discount rate. During times of volatility, significant judgment must be applied to determine whether credit changes are a short-term or long-term trend.

Management reviews finite-lived intangibles for indicators of impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Cash flows expected to be generated by the finite-lived intangibles are estimated over the intangible asset’s useful life based on updated projections on an undiscounted basis. If the evaluation indicates that the carrying value of the finite-lived intangible asset may not be recoverable, the potential impairment is measured at fair value.

During the fourth quarter of 2023, the Company performed its annual impairment test, as described in ASC Topic 350, as of October 1, 2023. Based on the Company’s annual impairment test, the calculated fair values for all of the Company’s reporting units with remaining goodwill were in excess of the respective reporting unit’s carrying value.

No impairment of goodwill or indefinite-lived intangible assets was recorded in 2023 or 2022.