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Investments Accounted for by the Equity Method and Variable Interest Entities - Unconsolidated Entities (Details) $ in Millions		3 Months Ended						9 Months Ended
	Sep. 01, 2020 USD ($) MW	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Investment of cash								$ 11	$ 14
Adjustment to noncontrolling interest	$ 83
Equity investments in affiliates		$ 1,001						1,001		$ 1,183
Operating revenues		332			$ 296			919	797
Operating income		123			90			305	218
Net income (loss)		42	$ 76	$ (107)	35	$ (36)	$ (47)	11	(48)
Current assets		773						773		608
Current liabilities		602						602		2,057
Non-current liabilities		$ 6,886						$ 6,886		5,380
Utah Solar Portfolio
Schedule of Equity Method Investments [Line Items]
Economic Interest		50.00%						50.00%
Equity investments in affiliates		$ 268						$ 268
Desert Sunlight
Schedule of Equity Method Investments [Line Items]
Economic Interest		25.00%						25.00%
Equity investments in affiliates		$ 257						$ 257
Agua Caliente Solar
Schedule of Equity Method Investments [Line Items]
Economic Interest		16.00%						16.00%
Equity investments in affiliates		$ 89						$ 89
GenConn
Schedule of Equity Method Investments [Line Items]
Economic Interest		50.00%						50.00%
Equity investments in affiliates		$ 90						$ 90
DGPV Holdco 1 LLC
Schedule of Equity Method Investments [Line Items]
Economic Interest		95.00%						95.00%
Equity investments in affiliates		$ 81						$ 81
DGPV Holdco 2 LLC
Schedule of Equity Method Investments [Line Items]
Economic Interest		95.00%						95.00%
Equity investments in affiliates		$ 63						$ 63
San Juan Mesa
Schedule of Equity Method Investments [Line Items]
Economic Interest		75.00%						75.00%
Equity investments in affiliates		$ 42						$ 42
Elkhorn Ridge
Schedule of Equity Method Investments [Line Items]
Economic Interest		66.70%						66.70%
Equity investments in affiliates		$ 39						$ 39
Avenal
Schedule of Equity Method Investments [Line Items]
Economic Interest		50.00%						50.00%
Equity investments in affiliates		$ (5)						$ (5)
Mesquite Star
Schedule of Equity Method Investments [Line Items]
Investment of cash	$ 79
Power generation capacity, megawatts | MW	419
Weighted average remaining contract life	12 years
Economic Interest		50.00%						50.00%
Equity investments in affiliates		$ 77						$ 77
DGPV Holdco 3
Schedule of Equity Method Investments [Line Items]
Operating revenues		0			9			14	22
Operating income		0			6			6	11
Net income (loss)		0			$ 16			(12)	$ 24
Current assets		0						0		39
Non-current assets		0						0		371
Current liabilities		0						0		61
Non-current liabilities		0						0		216
Redeemable noncontrolling interest		$ 0						$ 0		$ (1)

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