Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Carrying Amount [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent	[1]	$ 153	$ 98
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		17,680	16,712
Recourse debt		3,693	3,396
Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Value added tax		10	11
Accounts receivable - noncurrent	[1]	210	145
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		19,060	16,579
Recourse debt		2,186	3,529
Level 1 [Member] | Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent		0	0
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		0	0
Recourse debt		0	0
Level 2 [Member] | Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent		0	0
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		16,203	15,804
Recourse debt		2,186	3,529
Level 3 [Member] | Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent	[1]	210	145
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		2,857	775
Recourse debt		$ 0	$ 0

[1] ⁽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 Condensed Consolidated Balance Sheets. The fair value and carrying amount of these receivables exclude VAT of $10 million and $11 million as of June 30, 2020 and December 31, 2019, respectively.