Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

The following table summarizes the carrying amount of goodwill by reportable segment for the years ended December 31, 2017 and 2016 (in millions):



	US			Andes			MCAC		Eurasia			Total
Balance as of December 31, 2016
Goodwill	$	2,674		$	899		$	149	$	190		$	3,912
Accumulated impairment losses	(2,633		)	—			—		(122		)	(2,755		)
Net balance	41			899			149		68			1,157
Transfer to assets held-for-sale ⁽¹⁾	—			(30		)	—		(68		)	(98		)
Balance as of December 31, 2017
Goodwill	2,674			869			149		122			3,814
Accumulated impairment losses	(2,633		)	—			—		(122		)	(2,755		)
Net balance	$	41		$	869		$	149	$	—		$	1,059

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⁽¹⁾	See Note 22---Held-For-Sale Businesses and Dispositions for further information.

Schedule of Finite-Lived and Indefinite-Lived Intangible Assets

The following table summarizes the balances comprising Other intangible assets in the accompanying Consolidated Balance Sheets (in millions) as of the periods indicated:



	December 31, 2017							December 31, 2016
	Gross Balance		Accumulated Amortization			Net Balance		Gross Balance		Accumulated Amortization			Net Balance
Subject to Amortization
Internal-use software	$	416	$	(330	)	$	86	$	396	$	(304	)	$	92
Contracts	92		(21		)	71		53		(15		)	38
Contractual payment rights ⁽¹⁾	65		(47		)	18		56		(42		)	14
Project development rights	57		(1		)	56		4		(1		)	3
Other ⁽²⁾	98		(42		)	56		103		(37		)	66
Subtotal	728		(441		)	287		612		(399		)	213
Indefinite-Lived Intangible Assets
Land use rights	45		—			45		47		—			47
Water rights	20		—			20		17		—			17
Other	14		—			14		10		—			10
Subtotal	79		—			79		74		—			74
Total	$	807	$	(441	)	$	366	$	686	$	(399	)	$	287

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⁽¹⁾	Represent legal rights to receive system reliability payments from the regulator.


⁽²⁾	Includes management rights, sales concessions, gas extraction rights, and other individually insignificant intangible assets.

Schedule of Acquired Intangible Assets By Major Class

The following tables summarize other intangible assets acquired during the periods indicated (in millions):



December 31, 2017	Amount		Subject to Amortization/Indefinite-Lived	Weighted Average Amortization Period (in years)	Amortization Method
Project Development Rights	$	53	Subject to Amortization	30	Straight-line
Contracts	34		Subject to Amortization	25	Straight-line
Internal-use software	17		Subject to Amortization	7	Straight-line
Other	8		Various	N/A	N/A
Total	$	112



December 31, 2016	Amount		Subject to Amortization/Indefinite-Lived	Weighted Average Amortization Period (in years)	Amortization Method
Internal-use software	$	41	Subject to Amortization	4	Straight-line
Contracts	24		Subject to Amortization	26	Straight-line
Other	5		Subject to Amortization	13	Straight-line
Total	$	70

Schedule of Expected Amortization Expense

The following table summarizes the estimated amortization expense by intangible asset category for 2018 through 2022:



(in millions)	2018		2019		2020		2021		2022
Internal-use software	$	17	$	14	$	12	$	10	$	9
Contracts	5		5		5		5		5
Other	11		12		10		8		9
Total	$	33	$	31	$	27	$	23	$	23