Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Carrying Amount [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent	[1]	$ 224	$ 238
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		15,871	15,115
Recourse debt		4,909	4,966
Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Value added tax		24	27
Accounts receivable - noncurrent	[1]	316	310
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		16,216	15,592
Recourse debt		5,176	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		14,761	13,325
Recourse debt		5,176	4,696
Level 3 [Member] | Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent	[1]	316	290
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		1,455	2,267
Recourse debt		$ 0	$ 0

[1] These amounts principally relate to amounts due from CAMMESA, and are included in Noncurrent assets—Other in the accompanying Condensed Consolidated Balance Sheets. The fair value and carrying amount of these receivables exclude VAT of $24 million and $27 million as of June 30, 2016 and December 31, 2015, respectively.