General and Summary of Significant Accounting Policies Change in Accounting Estimate (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Accounting Estimate [Line Items]
Accounts receivable, net of allowance for doubtful accounts of $5 and $13, respectively	$ 1,479	$ 1,418	$ 1,300	$ 1,479
Other Assets, Current	(800)	(897)	(726)	(802)
Accounts and Financing Receivable, after Allowance for Credit Loss, Noncurrent	(1,319)			(1,351)
Other Assets, Noncurrent	(1,605)	(2,188)	(1,660)	(1,635)
Retained Earnings (Accumulated Deficit)	(731)	(1,089)	(680)	(692)
Stockholders' Equity Attributable to Noncontrolling Interest	2,217	1,769	2,086	2,233
Loans and Leases Receivable, Allowance	32
Accounts Receivable, Allowance for Credit Loss, Current	20	5	13
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		16	12
Accounts Receivable, Allowance for Credit Loss, Writeoff		(11)	(9)
Accounts Receivable, Allowance for Credit Loss, Recovery		0	0
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation		(4)	(9)
Accounts and Financing Receivable, Allowance for Credit Loss		63	62	68
Other Current Assets [Member]
Change in Accounting Estimate [Line Items]
Deferred Income Tax Assets, Net	$ 165			156
Accounts Receivable
Change in Accounting Estimate [Line Items]
Accounts Receivable, Allowance for Credit Loss, Current		9	9	4
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		9	11
Accounts Receivable, Allowance for Credit Loss, Writeoff		(11)	(9)
Accounts Receivable, Allowance for Credit Loss, Recovery		(2)	(3)
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation		0	0
Mong Duong Subsidiary [Member]
Change in Accounting Estimate [Line Items]
Accounts Receivable, Allowance for Credit Loss, Current		30	32	34
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		0	0
Accounts Receivable, Allowance for Credit Loss, Writeoff		0	0
Accounts Receivable, Allowance for Credit Loss, Recovery		(2)	(2)
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation		0	0
Other Entity [Member]
Change in Accounting Estimate [Line Items]
Accounts Receivable, Allowance for Credit Loss, Current		1	1	1
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		0	0
Accounts Receivable, Allowance for Credit Loss, Writeoff		0	0
Accounts Receivable, Allowance for Credit Loss, Recovery		0	0
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation		0	0
AES Argentina [Member]
Change in Accounting Estimate [Line Items]
Accounts Receivable, Allowance for Credit Loss, Current		23	20	$ 29
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		7	1
Accounts Receivable, Allowance for Credit Loss, Writeoff		0	0
Accounts Receivable, Allowance for Credit Loss, Recovery		0	(1)
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation		$ (4)	$ (9)
Accounting Standards Update 2016-13 [Member] | Mong Duong Subsidiary [Member]
Change in Accounting Estimate [Line Items]
Financing Receivable, Credit Loss Rate	2.40%
Accounts and Financing Receivable, Allowance for Credit Loss	$ 34
Accounting Standards Update 2016-13 [Member] | AES Argentina [Member]
Change in Accounting Estimate [Line Items]
Financing Receivable, Credit Loss Rate	41.20%
Accounting Standards Update 2016-13 [Member]
Change in Accounting Estimate [Line Items]
Accounts receivable, net of allowance for doubtful accounts of $5 and $13, respectively	$ 0
Other Assets, Current	(2)
Deferred Income Tax Assets, Net	9
Accounts and Financing Receivable, after Allowance for Credit Loss, Noncurrent	(32)
Other Assets, Noncurrent	(30)
Retained Earnings (Accumulated Deficit)	(39)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (16)