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Debt - Non-Recourse Debt Narrative (Details) - USD ($) $ in Millions			3 Months Ended			9 Months Ended
		Jul. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Debt defaults at risk of causing cross default			0			0
Loss on extinguishment of debt			$ (54)		$ (65)	$ (95)	$ (126)
Proceeds From Issuance Of Nonrecourse Debt						4,229	3,580
Nonrecourse Debt [Member] | IPALCO Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt						2
Proceeds From Issuance Of Nonrecourse Debt						475
Repayments of Long-term Debt						(470)
Nonrecourse Debt [Member] | AES Southland [Domain]
Debt Instrument [Line Items]
Loss on extinguishment of debt						0
Proceeds From Issuance Of Nonrecourse Debt	[1]					283
Repayments of Long-term Debt						0
Nonrecourse Debt [Member] | AES Tiete [Domain]
Debt Instrument [Line Items]
Loss on extinguishment of debt						0
Proceeds From Issuance Of Nonrecourse Debt						260
Repayments of Long-term Debt						0
Nonrecourse Debt [Member] | DPL Subsidiary [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt						34
Proceeds From Issuance Of Nonrecourse Debt						555
Repayments of Long-term Debt						(520)
Nonrecourse Debt [Member] | Gener Subsidiary [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt						0
Proceeds From Issuance Of Nonrecourse Debt						90
Repayments of Long-term Debt						(8)
Nonrecourse Debt [Member] | Cochrane Subsidiary [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt						1
Proceeds From Issuance Of Nonrecourse Debt						485
Repayments of Long-term Debt						(445)
Nonrecourse Debt [Member] | Mong Duong Subsidiary [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt						0
Proceeds From Issuance Of Nonrecourse Debt						150
Repayments of Long-term Debt						(1)
Nonrecourse Debt [Member] | Angamos [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt						7
Proceeds From Issuance Of Nonrecourse Debt						0
Repayments of Long-term Debt						(309)
Nonrecourse Debt [Member] | AES Panama
Debt Instrument [Line Items]
Loss on extinguishment of debt						16
Proceeds From Issuance Of Nonrecourse Debt						1,485
Repayments of Long-term Debt						$ (1,228)
Nonrecourse [Member] | IPALCO Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ (2)
Nonrecourse [Member] | DPL Subsidiary [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt			(34)				(43)
Nonrecourse [Member] | Mong Duong Subsidiary [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt							$ (31)
Nonrecourse [Member] | AES Panama
Debt Instrument [Line Items]
Loss on extinguishment of debt			(16)
Extinguishment of Debt, Amount			447
Nonrecourse [Member] | Colon [Domain]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount			610
Nonrecourse [Member] | Changuinola [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount			$ 171
4.41% SPV Loan [Member] | Nonrecourse [Member] | Mong Duong Subsidiary [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					4.41%		4.41%
7.18% SPV Loan [Member] [Member] | Nonrecourse [Member] | Mong Duong Subsidiary [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					7.18%		7.18%
3.95% Senior Notes due 2049 [Domain] | Senior Notes [Member] | DP&L [Member]
Debt Instrument [Line Items]
Issued new debt					$ 425		$ 425
Debt Instrument, Interest Rate, Stated Percentage					3.95%		3.95%
Variable Rate [Domain] | Senior Notes [Member] | DP&L [Member]
Debt Instrument [Line Items]
Issued new debt					$ 445		$ 445
Extinguishment of Debt, Amount							435
4.35% Senior Notes due 2029 [Domain] | Nonrecourse [Member] | DPL Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt					$ 400		$ 400
Debt Instrument, Interest Rate, Stated Percentage					4.35%		4.35%
7.25% Senior Notes due 2021 [Domain] | Nonrecourse [Member] | DPL Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt					$ 780		$ 780
Debt Instrument, Interest Rate, Stated Percentage			7.25%		7.25%	7.25%	7.25%
Extinguishment of Debt, Amount		$ 380					$ 400
4.125% Senior Notes due 2025 [Domain] | Nonrecourse [Member] | DPL Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt			$ 415			$ 415
Debt Instrument, Interest Rate, Stated Percentage			4.125%			4.125%
4.25% Senior Notes due 2030 [Domain] | Nonrecourse [Member] | IPALCO Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Issued new debt			$ 475			$ 475
Debt Instrument, Interest Rate, Stated Percentage			4.25%			4.25%
3.45% Senior Notes due 2020 [Domain] | Nonrecourse [Member] | IPALCO Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.45%			3.45%
Extinguishment of Debt, Amount				405
65 Million Term Loan due 2020 [Domain] | Nonrecourse [Member] | IPALCO Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount				65
6.25% Senior Notes due 2034 [Member] | Nonrecourse [Member] | Cochrane Subsidiary [Member]
Debt Instrument [Line Items]
Issued new debt			$ 485			$ 485
Debt Instrument, Interest Rate, Stated Percentage			6.25%			6.25%
Extinguishment of Debt, Amount			$ 445
4.375% Senior Notes due 2030 [Member] | Nonrecourse [Member] | AES Panama
Debt Instrument [Line Items]
Issued new debt			$ 1,400			$ 1,400
Debt Instrument, Interest Rate, Stated Percentage			4.375%			4.375%
AES Panama Term Loan due 2023 [Member] | Nonrecourse [Member] | AES Panama
Debt Instrument [Line Items]
Issued new debt			$ 105			$ 105
LIBOR 2.25% Senior Notes Due In 2029 and LIBOR 4.15% Senior Notes Due in 2029 [Member] | Nonrecourse [Member] | Mong Duong Subsidiary [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount							$ 1,100
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 1.75% Term Loan Due In 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						1.75%
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 2.25% Senior Notes Due In 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							2.25%
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 4.15% Senior Notes Due In 2029 [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							4.15%
Corporate and Other [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ (37)			$ 5
Corporate and Other [Member] | LIBOR 1.75% Term Loan Due In 2022 [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount							$ 343
Corporate and Other [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.00%			4.00%
[1] Issuances relate to the June 2017 long-term non-recourse debt financing to fund the Southland repowering construction projects.(2)Includes transactions at DPL and its subsidiary, DP&L. (3)Repayments relate to existing obligations at AES Panama, Changuinola, and Colon.

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