Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Carrying Amount [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent	[1]	$ 222	$ 238
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		15,887	15,115
Recourse debt		4,944	4,966
Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Value added tax		23	27
Accounts receivable - noncurrent	[1]	312	310
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		16,411	15,592
Recourse debt		5,298	4,696
Level 1 [Member] | Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent	[1]	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	[1]	0	20
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		14,381	13,325
Recourse debt		5,298	4,696
Level 3 [Member] | Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent	[1]	312	290
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		2,030	2,267
Recourse debt		$ 0	$ 0

[1] These amounts principally relate to amounts due from CAMMESA, 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 $23 million and $27 million as of September 30, 2016 and December 31, 2015, respectively.