Condensed Consolidating Financial Information of Guarantor Subsidiaries CONDENSED CONSOLIDATING CASH FLOW INFORMATION (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 254		$ 154
Net cash used in investing activities	(400)		(84)
Net cash provided by (used in) financing activities	135		(73)
Effect of foreign exchange rates	1		5
Net (decrease) increase in cash and cash equivalents	(10)		2
Cash and cash equivalents at beginning of period	36		203
Cash and cash equivalents at end of period	26		205
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	3		7
Net cash used in investing activities	(4)		(4)
Net cash provided by (used in) financing activities	1		(3)
Effect of foreign exchange rates	0		0
Net (decrease) increase in cash and cash equivalents	0		0
Cash and cash equivalents at beginning of period	0		0
Cash and cash equivalents at end of period	0		0
URNA [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	85		87
Net cash used in investing activities	(252)		(39)
Net cash provided by (used in) financing activities	164		(50)
Effect of foreign exchange rates	0		0
Net (decrease) increase in cash and cash equivalents	(3)		(2)
Cash and cash equivalents at beginning of period	6		4
Cash and cash equivalents at end of period	3		2
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	109		21
Net cash used in investing activities	(110)		(22)
Net cash provided by (used in) financing activities	1		1
Effect of foreign exchange rates	0		0
Net (decrease) increase in cash and cash equivalents	0		0
Cash and cash equivalents at beginning of period	0		0
Cash and cash equivalents at end of period	0		0
Non Guarantor Subsidiaries Foreign [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	28		18
Net cash used in investing activities	(34)		(19)
Net cash provided by (used in) financing activities	(2)		0
Effect of foreign exchange rates	1		5
Net (decrease) increase in cash and cash equivalents	(7)		4
Cash and cash equivalents at beginning of period	30		199
Cash and cash equivalents at end of period	23		203
Non Guarantor Subsidiaries SPV [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	29		21
Net cash used in investing activities	0		0
Net cash provided by (used in) financing activities	(29)		(21)
Effect of foreign exchange rates	0		0
Net (decrease) increase in cash and cash equivalents	0		0
Cash and cash equivalents at beginning of period	0		0
Cash and cash equivalents at end of period	0	[1]	0
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0		0
Net cash used in investing activities	0		0
Net cash provided by (used in) financing activities	0		0
Effect of foreign exchange rates	0		0
Net (decrease) increase in cash and cash equivalents	0		0
Cash and cash equivalents at beginning of period	0		0
Cash and cash equivalents at end of period	$ 0		$ 0

[1] Includes debt issued by Funding SPV associated with the proposed merger with RSC, as discussed further in note 5 to our condensed consolidated financial statements.