Derivative Instruments and Hedging Activities - Schedule of Effects of Company’s AOCI (OCL) Balance Attributable to Interest Rate Swaps Designated as Cash Flow Hedge Derivatives, Net of Tax (Details) - USD ($)
$ in Millions

Derivative Instruments and Hedging Activities - Schedule of Effects of Company’s AOCI (OCL) Balance Attributable to Interest Rate Swaps Designated as Cash Flow Hedge Derivatives, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 5,542	$ 5,711	$ 5,564	$ 4,994
Mark-to-market of cash flow hedge accounting contracts	(5)	(13)	(23)	(13)
Balance at end of period	5,715	5,624	5,715	5,624
Losses expected to be realized from OCL during the next 12 months	(1)		(1)
Accumulated (OCL) OCI ending balance, income tax expense	(4)	0	(4)	0
Accumulated OCI (OCL)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(17)	18	14	18
Balance at end of period	(22)	5	(22)	5
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassified from accumulated OCI/OCL to income due to realization of previously deferred amounts	(1)	(1)	(1)	(3)
Mark-to-market of cash flow hedge accounting contracts	(4)	(12)	(22)	(10)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest \| Rosamond South I Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down	0	0	(4)	0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest \| Daggett 1 Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down	0	0	(6)	0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest \| Luna Valley Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down	0	0	(8)	0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest \| Pine Forest Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down	0	0	5	0
Accumulated (OCL) OCI attributable to noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at end of period	(9)	4	(9)	4
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(10)	5	3	7
Balance at end of period	(13)	1	(13)	1
Clearway Energy LLC \| Rosamond South I Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down			1
Clearway Energy LLC \| Daggett 1 Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down			4
Clearway Energy LLC \| Luna Valley Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down			5
Clearway Energy LLC \| Pine Forest Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down			3
Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	3,693	3,561	3,501	2,893
Balance at end of period	$ 3,666	$ 3,490	3,666	$ 3,490
Noncontrolling Interest \| Rosamond South I Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down			3
Noncontrolling Interest \| Daggett 1 Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down			2
Noncontrolling Interest \| Luna Valley Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down			3
Noncontrolling Interest \| Pine Forest Drop Down
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Drop Down			$ 2