Intangibles, net (Tables)

12 Months Ended

Dec. 31, 2019

Intangible Assets Net Excluding Goodwill [Abstract]

Identified Intangible Assets by Major Classification

Identified intangible assets by major classification, affected by the fluctuation of foreign currency rates, consist of the following (in millions):

			Accumulated			Net Book
	Gross		Amortization			Value
December 31, 2019:
Trademarks and patents	$	38	$	(9	)	$	29
Customer relationships		116		(57	)		59
Other		2		—			2
Total identified intangibles	$	156	$	(66	)	$	90

December 31, 2018:
Trademarks and patents	$	103	$	(31	)	$	72
Customer relationships		118		(46	)		72
Other		11		(11	)		—
Total identified intangibles	$	232	$	(88	)	$	144

Schedule of Estimated Amortization of Intangible Assets Excluding Assets Held-for-Sale

Amortization expense was $19 million, $20 million and $22 million for the years ended December 31, 2019, 2018, and 2017, respectively. The following table represents the total estimated amortization of intangible assets for the five succeeding years, excluding assets held-for-sale (in millions):

For the Year Ending December 31,	Estimated Amortization Expense
2020	$	15
2021		15
2022		14
2023		10
2024		8