Condensed Consolidating Financial Information of Guarantor Subsidiaries CONDENSED CONSOLIDATING CASH FLOW INFORMATION (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 1,551	$ 721	$ 612
Net cash used in investing activities	(1,177)	(2,104)	(865)
Net cash used in financing activities	(295)	1,453	80
Effect of foreign exchange rates	(10)	0	6
Net increase (decrease) in cash and cash equivalents	69	70	(167)
Cash and cash equivalents at beginning of year	106	36	203
Cash and cash equivalents at end of year	175	106	36
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	26	7	0
Net cash used in investing activities	(26)	(7)	(13)
Net cash used in financing activities	0	0	13
Effect of foreign exchange rates	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	0	0	0
URNA [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	1,285	654	280
Net cash used in investing activities	(1,018)	(1,851)	(315)
Net cash used in financing activities	(270)	1,211	37
Effect of foreign exchange rates	0	0	0
Net increase (decrease) in cash and cash equivalents	(3)	14	2
Cash and cash equivalents at beginning of year	20	6	4
Cash and cash equivalents at end of year	17	20	6
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	4	151	236
Net cash used in investing activities	0	(155)	(241)
Net cash used in financing activities	(4)	4	5
Effect of foreign exchange rates	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	0	0	0
Non Guarantor Subsidiaries Foreign [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	216	153	132
Net cash used in investing activities	(133)	(91)	(296)
Net cash used in financing activities	(1)	(6)	(11)
Effect of foreign exchange rates	(10)	0	6
Net increase (decrease) in cash and cash equivalents	72	56	(169)
Cash and cash equivalents at beginning of year	86	30	199
Cash and cash equivalents at end of year	158	86	30
Non Guarantor Subsidiaries SPV [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	20	(244)	(36)
Net cash used in investing activities	0	0	0
Net cash used in financing activities	(20)	244	36
Effect of foreign exchange rates	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	0	0	0
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0	0	0
Net cash used in investing activities	0	0	0
Net cash used in financing activities	0	0	0
Effect of foreign exchange rates	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	$ 0	$ 0	$ 0