Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Carrying Amount [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent	[1]	$ 258	$ 270
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		15,633	15,461
Recourse debt		4,924	4,966
Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Value added tax		24	27
Accounts receivable - noncurrent	[1]	337	342
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		16,064	15,939
Recourse debt		4,998	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		13,654	13,672
Recourse debt		4,998	4,696
Level 3 [Member] | Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Accounts receivable - noncurrent	[1]	337	322
Liabilities, Fair Value Disclosure [Abstract]
Non-recourse debt		2,410	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 March 31, 2016 and December 31, 2015, respectively.