Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table summarizes the carrying amount of goodwill by reportable segment for the years ended December 31, 2020 and 2019 (in millions):

	US and Utilities		South America		MCAC		Eurasia		Total
Balance as of December 31, 2019
Goodwill	$	2,786	$	868	$	16	$	—	$	3,670
Accumulated impairment losses	(2,611)		—		—		—		(2,611)
Net balance	175		868		16		—		1,059
Balance as of December 31, 2020
Goodwill	2,788		868		16		—		3,672
Accumulated impairment losses	(2,611)		—		—		—		(2,611)
Net balance	$	177	$	868	$	16	$	—	$	1,061

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, 2020						December 31, 2019
	Gross Balance		Accumulated Amortization		Net Balance		Gross Balance		Accumulated Amortization		Net Balance
Subject to Amortization
Internal-use software	$	386	$	(255)	$	131	$	367	$	(228)	$	139
Contracts	157		(38)		119		134		(29)		105
Project development rights (1)	203		(5)		198		100		(1)		99
Emissions allowances (2)	64		—		64		24		—		24
Concession rights	201		(18)		183		39		(35)		4
Other (3)	59		(14)		45		43		(14)		29
Subtotal	1,070		(330)		740		707		(307)		400
Indefinite-Lived Intangible Assets
Land use rights	39		—		39		21		—		21
Water rights	20		—		20		20		—		20
Transmission rights	22		—		22		23		—		23
Other	6		—		6		5		—		5
Subtotal	87		—		87		69		—		69
Total	$	1,157	$	(330)	$	827	$	776	$	(307)	$	469

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(1)Includes emission offset fee to the Air Quality Management District (AQMD) in order to transfer emission offsets from retired legacy Southland units to the new CCGT.

(2)Acquired or purchased emissions allowances are finite-lived intangible assets that are expensed when utilized and included in net income for the year.

(3)Includes management rights, renewable energy credits and incentives, 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, 2020	Amount		Subject to Amortization/Indefinite-Lived	Weighted Average Amortization Period (in years)	Amortization Method
Internal-use software	$	35	Subject to Amortization	4	Straight-line
Contracts	28		Subject to Amortization	20	Straight-line
Project development rights	109		Subject to Amortization	30	Straight-line
Emissions allowances	56		Subject to Amortization	Various	As utilized
Transmission rights	20		Indefinite-Lived	N/A	N/A
Concession rights (1)	184		Subject to Amortization	12	Straight-line
Other	22		Various	N/A	N/A
Total	$	454

December 31, 2019	Amount		Subject to Amortization/Indefinite-Lived	Weighted Average Amortization Period (in years)	Amortization Method
Internal-use software	$	61	Subject to Amortization	5	Straight-line
Contracts	2		Subject to Amortization	35	Straight-line
Project development rights	8		Subject to Amortization	29	Straight-line
Emissions allowances	22		Subject to Amortization	Various	As utilized
Transmission rights	23		Indefinite-Lived	N/A	N/A
Other	5		Various	N/A	N/A
Total	$	121

Schedule of Expected Amortization Expense

The following table summarizes the estimated amortization expense by intangible asset category for 2021 through 2025:

(in millions)	2021		2022		2023		2024		2025
Internal-use software	$	36	$	30	$	25	$	23	$	21
Contracts	9		9		9		6		6
Concession rights	16		16		17		16		16
Other	9		9		8		8		7
Total	$	70	$	64	$	59	$	53	$	50