Fair Value (Instruments Not Measured at Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Non-recourse debt	$ 15,380	[1]	$ 14,759	[1]
Recourse debt	5,669		5,962
Carrying Amount
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable - noncurrent	260	[2]	304	[2]
Non-recourse debt	15,380		14,759
Recourse debt	5,669		5,962
Fair Value
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable - noncurrent	194	[2]	188	[2]
Non-recourse debt	15,620		15,481
Recourse debt	6,164		6,628
Value added tax	46		55
Fair Value | Level 1
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable - noncurrent	0	[2]	0	[2]
Non-recourse debt	0		0
Recourse debt	0		0
Fair Value | Level 2
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable - noncurrent	0	[2]	0	[2]
Non-recourse debt	13,397		13,266
Recourse debt	6,164		6,628
Fair Value | Level 3
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable - noncurrent	194	[2]	188	[2]
Non-recourse debt	2,223		2,215
Recourse debt	$ 0		$ 0

[1] Non-recourse debt of $658 million as of December 31, 2013 was excluded from non-recourse debt and included in current and noncurrent liabilities of held for sale and discontinued businesses in the accompanying Consolidated Balance Sheets. There were no amounts excluded in 2012.

[2] These accounts receivable principally relate to amounts due from CAMMESA, the administrator of the wholesale electricity market in Argentina, and are included in “Noncurrent assets — Other” in the accompanying consolidated balance sheets. The fair value of these accounts receivable excludes value-added tax of $46 million and $55 million at December 31, 2013 and 2012, respectively.