Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
ASSETS
Non-Recourse Debt			$ 15,645
Liabilities [Abstract]
Recourse debt		$ 3,396	3,655
Carrying Amount
ASSETS
Accounts receivable - noncurrent	[1]	98	100
Non-Recourse Debt		16,712	15,645
Liabilities [Abstract]
Recourse debt		3,396	3,655
Fair Value
ASSETS
Accounts receivable - noncurrent	[1]	145	209
Non-Recourse Debt		16,579	16,225
Liabilities [Abstract]
Recourse debt		3,529	3,621
Value added tax		11	16
Fair Value | Level 1
ASSETS
Accounts receivable - noncurrent		0	0
Non-Recourse Debt		0	0
Liabilities [Abstract]
Recourse debt		0	0
Fair Value | Level 2
ASSETS
Accounts receivable - noncurrent		0	0
Non-Recourse Debt		15,804	13,524
Liabilities [Abstract]
Recourse debt		3,529	3,621
Fair Value | Level 3
ASSETS
Accounts receivable - noncurrent	[1]	145	209
Non-Recourse Debt		775	2,701
Liabilities [Abstract]
Recourse debt		$ 0	$ 0

[1] These amounts primarily relate to amounts due from CAMMESA, the administrator of the wholesale electricity market in Argentina, and amounts impacted by the Stabilization Fund enacted by the Chilean government and are included in Other noncurrent assets in the accompanying Consolidated Balance Sheets. The fair value and carrying amount of the Argentina receivables exclude VAT of $11 million and $16 million as of December 31, 2019 and 2018, respectively.