Condensed Consolidating Financial Information of Guarantor Subsidiaries CONDENSED CONSOLIDATING CASH FLOW INFORMATION (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions
Net cash provided by operating activities	$ 508	$ 409
Net cash used in investing activities	(231)	(175)
Net cash used in financing activities	(218)	(191)
Effect of foreign exchange rates	(7)	(2)
Net increase in cash and cash equivalents	52	41
Cash and cash equivalents at beginning of period	175	106
Cash and cash equivalents at end of period	227	147
Parent
Condensed Financial Statements, Captions
Net cash provided by operating activities	3	16
Net cash used in investing activities	(3)	(16)
Net cash used in financing activities	0	0
Effect of foreign exchange rates	0	0
Net 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
Condensed Financial Statements, Captions
Net cash provided by operating activities	390	295
Net cash used in investing activities	(219)	(148)
Net cash used in financing activities	(165)	(143)
Effect of foreign exchange rates	0	0
Net increase in cash and cash equivalents	6	4
Cash and cash equivalents at beginning of period	17	20
Cash and cash equivalents at end of period	23	24
Guarantor Subsidiaries
Condensed Financial Statements, Captions
Net cash provided by operating activities	1	(1)
Net cash used in investing activities	0	0
Net cash used in financing activities	(1)	1
Effect of foreign exchange rates	0	0
Net 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
Condensed Financial Statements, Captions
Net cash provided by operating activities	62	50
Net cash used in investing activities	(9)	(11)
Net cash used in financing activities	0	0
Effect of foreign exchange rates	(7)	(2)
Net increase in cash and cash equivalents	46	37
Cash and cash equivalents at beginning of period	158	86
Cash and cash equivalents at end of period	204	123
Non Guarantor Subsidiaries SPV
Condensed Financial Statements, Captions
Net cash provided by operating activities	52	49
Net cash used in investing activities	0	0
Net cash used in financing activities	(52)	(49)
Effect of foreign exchange rates	0	0
Net 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
Eliminations
Condensed Financial Statements, Captions
Net cash provided by operating activities	0	0
Net cash used in investing activities	0	0
Net cash used in financing activities	0	0
Effect of foreign exchange rates	0	0
Net 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